Public bug reported:

Device: Dell Precision 7530
In the BIOS, the Switchable Graphics option is deactived, which means only the 
nVidia GPU is used.

When booting 19.04 beta live USB, the screen becomes very dark and
brightness cannot be adjusted. (The same issue happens with 18.04.2)

There is only a "nv_backlight" in /sys/class/backlight/ (i.e. no
intel_backlight):

$ ll /sys/class/backlight/
total 0
drwxr-xr-x  2 root root 0 Mar 27 09:36 ./
drwxr-xr-x 74 root root 0 Mar 27 09:28 ../
lrwxrwxrwx  1 root root 0 Mar 27 09:28 nv_backlight -> 
../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0/card0-eDP-1/nv_backlight/

Trying to manually change brightness doesn't do anything:

$ sudo su
root@ubuntu:/home/ubuntu# cd /sys/class/backlight/nv_backlight
root@ubuntu:/sys/class/backlight/nv_backlight# ll
total 0
drwxr-xr-x 3 root root    0 Mar 27 09:28 ./
drwxr-xr-x 4 root root    0 Mar 27 09:28 ../
-r--r--r-- 1 root root 4096 Mar 27 09:37 actual_brightness
-rw-r--r-- 1 root root 4096 Mar 27 09:37 bl_power
-rw-r--r-- 1 root root 4096 Mar 27 09:28 brightness
lrwxrwxrwx 1 root root    0 Mar 27 09:37 device -> ../../card0-eDP-1/
-r--r--r-- 1 root root 4096 Mar 27 09:28 max_brightness
drwxr-xr-x 2 root root    0 Mar 27 09:28 power/
lrwxrwxrwx 1 root root    0 Mar 27 09:28 subsystem -> 
../../../../../../../../class/backlight/
-r--r--r-- 1 root root 4096 Mar 27 09:28 type
-rw-r--r-- 1 root root 4096 Mar 27 09:28 uevent
root@ubuntu:/sys/class/backlight/nv_backlight# cat actual_brightness
100
root@ubuntu:/sys/class/backlight/nv_backlight# cat brightness
100
root@ubuntu:/sys/class/backlight/nv_backlight# cat max_brightness
100
root@ubuntu:/sys/class/backlight/nv_backlight# echo 50 > brightness
root@ubuntu:/sys/class/backlight/nv_backlight# cat brightness
50

Although the value is changed, the screen brightness doesn't change.

in dmesg, I can see the following:

[    0.241878] ACPI: Added _OSI(Module Device)
[    0.241878] ACPI: Added _OSI(Processor Device)
[    0.241878] ACPI: Added _OSI(3.0 _SCP Extensions)
[    0.241878] ACPI: Added _OSI(Processor Aggregator Device)
[    0.241878] ACPI: Added _OSI(Linux-Dell-Video)
[    0.241878] ACPI: Added _OSI(Linux-Lenovo-NV-HDMI-Audio)
[    0.241878] ACPI: Added _OSI(Linux-HPI-Hybrid-Graphics)
[    0.286326] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS01._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.286332] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.286334] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.286336] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS01._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.286339] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.286340] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.287096] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS02._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.287099] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.287101] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.287102] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS02._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.287105] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.287106] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.287858] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS03._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.287861] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.287863] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.287864] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS03._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.287867] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.287869] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.288614] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS04._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.288617] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.288619] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.288620] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS04._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.288623] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.288625] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.289376] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS05._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.289379] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.289381] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.289382] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS05._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.289385] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.289386] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.290131] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS06._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.290134] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.290136] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.290137] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS06._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.290140] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.290142] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.290892] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS07._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.290895] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.290897] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.290898] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS07._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.290900] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.290902] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.291646] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS08._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.291649] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.291651] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.291652] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS08._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.291654] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.291656] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.292401] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS09._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.292404] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.292406] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.292407] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS09._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.292410] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.292411] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.293113] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS10._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.293117] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.293119] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.293120] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS10._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.293122] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.293124] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.293871] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS11._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.293874] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.293876] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.293877] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS11._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.293880] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.293882] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.294528] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS12._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.294531] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.294533] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.294534] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS12._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.294537] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.294539] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.295286] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS13._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.295289] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.295291] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.295292] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS13._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.295295] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.295297] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.296046] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS14._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.296049] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.296051] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.296052] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS14._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.296055] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.296057] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.296772] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.USR1._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.296776] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.296777] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.296778] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.USR1._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.296781] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.296783] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.296785] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.USR2._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.296788] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.296790] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.296791] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.USR2._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.296793] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.296795] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.296821] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS01._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.296824] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.296826] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.296827] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS01._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.296830] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.296831] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.296855] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS02._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.296858] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.296860] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.296861] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS02._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.296864] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.296866] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.296889] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS03._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.296892] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.296894] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.296895] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS03._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.296898] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.296900] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.296923] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS04._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.296926] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.296928] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.296929] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS04._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.296932] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.296934] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.296957] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS05._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.296960] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.296962] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.296963] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS05._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.296966] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.296968] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.296991] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS06._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.296994] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.296996] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.296997] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS06._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.297000] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.297002] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.297025] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS07._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.297028] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.297030] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.297031] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS07._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.297034] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.297036] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.297060] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS08._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.297063] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.297064] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.297065] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS08._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.297068] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.297070] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.297094] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS09._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.297097] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.297098] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.297099] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS09._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.297102] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.297104] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.297128] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS10._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.297131] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.297133] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.297134] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS10._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.297136] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.297138] ACPI: Skipping parse of AML opcode: Method (0x0014)
[    0.297140] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS11.CAMB], AE_ALREADY_EXISTS (20181213/dswload2-324)
[    0.297143] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
[    0.297145] ACPI: Skipping parse of AML opcode: Device (0x5B82)
[    0.301048] ACPI: 13 ACPI AML tables successfully acquired and loaded
[    0.312924] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: xorg 1:7.7+19ubuntu12
ProcVersionSignature: Ubuntu 5.0.0-7.8-generic 5.0.0
Uname: Linux 5.0.0-7-generic x86_64
ApportVersion: 2.20.10-0ubuntu23
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperVersion: 1.402
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Wed Mar 27 09:29:56 2019
DistUpgraded: Fresh install
DistroCodename: disco
DistroVariant: ubuntu
ExtraDebuggingInterest: No
GraphicsCard:
 NVIDIA Corporation GP107GLM [Quadro P1000 Mobile] [10de:1cbb] (rev a1) 
(prog-if 00 [VGA controller])
   Subsystem: Dell GP107GLM [Quadro P1000 Mobile] [1028:1889]
LiveMediaBuild: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190326.2)
MachineType: Dell Inc. Precision 7530
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=C.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/username.seed 
boot=casper quiet splash ---
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/10/2018
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.4.2
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvr1.4.2:bd09/10/2018:svnDellInc.:pnPrecision7530:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct10:cvr:
dmi.product.family: Precision
dmi.product.name: Precision 7530
dmi.product.sku: 0889
dmi.sys.vendor: Dell Inc.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.97-1
version.libgl1-mesa-dri: libgl1-mesa-dri 19.0.0-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.4-1ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20180925-2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug disco ubuntu

** Description changed:

  Device: Dell Precision 7530
  In the BIOS, the Switchable Graphics option is deactived, which means only 
the nVidia GPU is used.
  
- When booting 19.04 live USB, the screen becomes very dark and brightness
- cannot be adjusted.
+ When booting 19.04 beta live USB, the screen becomes very dark and
+ brightness cannot be adjusted. (The same issue happens with 18.04.2)
  
  There is only a "nv_backlight" in /sys/class/backlight/ (i.e. no
  intel_backlight):
  
  $ ll /sys/class/backlight/
  total 0
  drwxr-xr-x  2 root root 0 Mar 27 09:36 ./
  drwxr-xr-x 74 root root 0 Mar 27 09:28 ../
  lrwxrwxrwx  1 root root 0 Mar 27 09:28 nv_backlight -> 
../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0/card0-eDP-1/nv_backlight/
  
  Trying to manually change brightness doesn't do anything:
  
  $ sudo su
  root@ubuntu:/home/ubuntu# cd /sys/class/backlight/nv_backlight
  root@ubuntu:/sys/class/backlight/nv_backlight# ll
  total 0
  drwxr-xr-x 3 root root    0 Mar 27 09:28 ./
  drwxr-xr-x 4 root root    0 Mar 27 09:28 ../
  -r--r--r-- 1 root root 4096 Mar 27 09:37 actual_brightness
  -rw-r--r-- 1 root root 4096 Mar 27 09:37 bl_power
  -rw-r--r-- 1 root root 4096 Mar 27 09:28 brightness
  lrwxrwxrwx 1 root root    0 Mar 27 09:37 device -> ../../card0-eDP-1/
  -r--r--r-- 1 root root 4096 Mar 27 09:28 max_brightness
  drwxr-xr-x 2 root root    0 Mar 27 09:28 power/
  lrwxrwxrwx 1 root root    0 Mar 27 09:28 subsystem -> 
../../../../../../../../class/backlight/
  -r--r--r-- 1 root root 4096 Mar 27 09:28 type
  -rw-r--r-- 1 root root 4096 Mar 27 09:28 uevent
- root@ubuntu:/sys/class/backlight/nv_backlight# cat actual_brightness 
+ root@ubuntu:/sys/class/backlight/nv_backlight# cat actual_brightness
  100
- root@ubuntu:/sys/class/backlight/nv_backlight# cat brightness 
+ root@ubuntu:/sys/class/backlight/nv_backlight# cat brightness
  100
- root@ubuntu:/sys/class/backlight/nv_backlight# cat max_brightness 
+ root@ubuntu:/sys/class/backlight/nv_backlight# cat max_brightness
  100
- root@ubuntu:/sys/class/backlight/nv_backlight# echo 50 > brightness 
- root@ubuntu:/sys/class/backlight/nv_backlight# cat brightness 
+ root@ubuntu:/sys/class/backlight/nv_backlight# echo 50 > brightness
+ root@ubuntu:/sys/class/backlight/nv_backlight# cat brightness
  50
  
  Although the value is changed, the screen brightness doesn't change.
- 
  
  in dmesg, I can see the following:
  
  [    0.241878] ACPI: Added _OSI(Module Device)
  [    0.241878] ACPI: Added _OSI(Processor Device)
  [    0.241878] ACPI: Added _OSI(3.0 _SCP Extensions)
  [    0.241878] ACPI: Added _OSI(Processor Aggregator Device)
  [    0.241878] ACPI: Added _OSI(Linux-Dell-Video)
  [    0.241878] ACPI: Added _OSI(Linux-Lenovo-NV-HDMI-Audio)
  [    0.241878] ACPI: Added _OSI(Linux-HPI-Hybrid-Graphics)
  [    0.286326] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS01._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.286332] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.286334] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.286336] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS01._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.286339] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.286340] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.287096] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS02._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.287099] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.287101] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.287102] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS02._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.287105] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.287106] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.287858] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS03._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.287861] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.287863] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.287864] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS03._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.287867] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.287869] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.288614] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS04._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.288617] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.288619] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.288620] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS04._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.288623] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.288625] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.289376] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS05._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.289379] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.289381] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.289382] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS05._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.289385] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.289386] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.290131] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS06._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.290134] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.290136] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.290137] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS06._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.290140] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.290142] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.290892] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS07._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.290895] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.290897] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.290898] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS07._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.290900] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.290902] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.291646] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS08._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.291649] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.291651] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.291652] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS08._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.291654] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.291656] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.292401] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS09._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.292404] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.292406] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.292407] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS09._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.292410] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.292411] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.293113] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS10._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.293117] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.293119] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.293120] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS10._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.293122] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.293124] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.293871] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS11._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.293874] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.293876] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.293877] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS11._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.293880] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.293882] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.294528] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS12._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.294531] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.294533] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.294534] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS12._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.294537] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.294539] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.295286] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS13._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.295289] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.295291] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.295292] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS13._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.295295] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.295297] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296046] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS14._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296049] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296051] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296052] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS14._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296055] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296057] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296772] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.USR1._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296776] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296777] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296778] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.USR1._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296781] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296783] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296785] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.USR2._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296788] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296790] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296791] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.USR2._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296793] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296795] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296821] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS01._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296824] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296826] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296827] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS01._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296830] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296831] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296855] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS02._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296858] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296860] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296861] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS02._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296864] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296866] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296889] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS03._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296892] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296894] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296895] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS03._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296898] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296900] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296923] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS04._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296926] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296928] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296929] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS04._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296932] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296934] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296957] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS05._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296960] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296962] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296963] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS05._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296966] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296968] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296991] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS06._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296994] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296996] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296997] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS06._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.297000] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.297002] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.297025] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS07._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.297028] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.297030] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.297031] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS07._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.297034] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.297036] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.297060] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS08._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.297063] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.297064] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.297065] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS08._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.297068] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.297070] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.297094] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS09._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.297097] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.297098] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.297099] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS09._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.297102] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.297104] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.297128] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS10._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.297131] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.297133] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.297134] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS10._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.297136] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.297138] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.297140] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS11.CAMB], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.297143] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.297145] ACPI: Skipping parse of AML opcode: Device (0x5B82)
  [    0.301048] ACPI: 13 ACPI AML tables successfully acquired and loaded
  [    0.312924] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
  
  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: xorg 1:7.7+19ubuntu12
  ProcVersionSignature: Ubuntu 5.0.0-7.8-generic 5.0.0
  Uname: Linux 5.0.0-7-generic x86_64
  ApportVersion: 2.20.10-0ubuntu23
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperVersion: 1.402
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Mar 27 09:29:56 2019
  DistUpgraded: Fresh install
  DistroCodename: disco
  DistroVariant: ubuntu
  ExtraDebuggingInterest: No
  GraphicsCard:
-  NVIDIA Corporation GP107GLM [Quadro P1000 Mobile] [10de:1cbb] (rev a1) 
(prog-if 00 [VGA controller])
-    Subsystem: Dell GP107GLM [Quadro P1000 Mobile] [1028:1889]
+  NVIDIA Corporation GP107GLM [Quadro P1000 Mobile] [10de:1cbb] (rev a1) 
(prog-if 00 [VGA controller])
+    Subsystem: Dell GP107GLM [Quadro P1000 Mobile] [1028:1889]
  LiveMediaBuild: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190326.2)
  MachineType: Dell Inc. Precision 7530
  ProcEnviron:
-  TERM=xterm-256color
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=C.UTF-8
-  SHELL=/bin/bash
+  TERM=xterm-256color
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=C.UTF-8
+  SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz 
file=/cdrom/preseed/username.seed boot=casper quiet splash ---
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/10/2018
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.4.2
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.4.2:bd09/10/2018:svnDellInc.:pnPrecision7530:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct10:cvr:
  dmi.product.family: Precision
  dmi.product.name: Precision 7530
  dmi.product.sku: 0889
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.97-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 19.0.0-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.4-1ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20180925-2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1821882

Title:
  Screen is very dark and brightness cannot be adjusted

Status in xorg package in Ubuntu:
  New

Bug description:
  Device: Dell Precision 7530
  In the BIOS, the Switchable Graphics option is deactived, which means only 
the nVidia GPU is used.

  When booting 19.04 beta live USB, the screen becomes very dark and
  brightness cannot be adjusted. (The same issue happens with 18.04.2)

  There is only a "nv_backlight" in /sys/class/backlight/ (i.e. no
  intel_backlight):

  $ ll /sys/class/backlight/
  total 0
  drwxr-xr-x  2 root root 0 Mar 27 09:36 ./
  drwxr-xr-x 74 root root 0 Mar 27 09:28 ../
  lrwxrwxrwx  1 root root 0 Mar 27 09:28 nv_backlight -> 
../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0/card0-eDP-1/nv_backlight/

  Trying to manually change brightness doesn't do anything:

  $ sudo su
  root@ubuntu:/home/ubuntu# cd /sys/class/backlight/nv_backlight
  root@ubuntu:/sys/class/backlight/nv_backlight# ll
  total 0
  drwxr-xr-x 3 root root    0 Mar 27 09:28 ./
  drwxr-xr-x 4 root root    0 Mar 27 09:28 ../
  -r--r--r-- 1 root root 4096 Mar 27 09:37 actual_brightness
  -rw-r--r-- 1 root root 4096 Mar 27 09:37 bl_power
  -rw-r--r-- 1 root root 4096 Mar 27 09:28 brightness
  lrwxrwxrwx 1 root root    0 Mar 27 09:37 device -> ../../card0-eDP-1/
  -r--r--r-- 1 root root 4096 Mar 27 09:28 max_brightness
  drwxr-xr-x 2 root root    0 Mar 27 09:28 power/
  lrwxrwxrwx 1 root root    0 Mar 27 09:28 subsystem -> 
../../../../../../../../class/backlight/
  -r--r--r-- 1 root root 4096 Mar 27 09:28 type
  -rw-r--r-- 1 root root 4096 Mar 27 09:28 uevent
  root@ubuntu:/sys/class/backlight/nv_backlight# cat actual_brightness
  100
  root@ubuntu:/sys/class/backlight/nv_backlight# cat brightness
  100
  root@ubuntu:/sys/class/backlight/nv_backlight# cat max_brightness
  100
  root@ubuntu:/sys/class/backlight/nv_backlight# echo 50 > brightness
  root@ubuntu:/sys/class/backlight/nv_backlight# cat brightness
  50

  Although the value is changed, the screen brightness doesn't change.

  in dmesg, I can see the following:

  [    0.241878] ACPI: Added _OSI(Module Device)
  [    0.241878] ACPI: Added _OSI(Processor Device)
  [    0.241878] ACPI: Added _OSI(3.0 _SCP Extensions)
  [    0.241878] ACPI: Added _OSI(Processor Aggregator Device)
  [    0.241878] ACPI: Added _OSI(Linux-Dell-Video)
  [    0.241878] ACPI: Added _OSI(Linux-Lenovo-NV-HDMI-Audio)
  [    0.241878] ACPI: Added _OSI(Linux-HPI-Hybrid-Graphics)
  [    0.286326] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS01._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.286332] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.286334] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.286336] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS01._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.286339] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.286340] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.287096] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS02._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.287099] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.287101] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.287102] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS02._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.287105] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.287106] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.287858] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS03._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.287861] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.287863] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.287864] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS03._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.287867] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.287869] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.288614] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS04._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.288617] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.288619] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.288620] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS04._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.288623] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.288625] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.289376] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS05._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.289379] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.289381] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.289382] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS05._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.289385] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.289386] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.290131] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS06._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.290134] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.290136] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.290137] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS06._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.290140] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.290142] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.290892] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS07._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.290895] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.290897] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.290898] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS07._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.290900] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.290902] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.291646] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS08._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.291649] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.291651] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.291652] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS08._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.291654] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.291656] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.292401] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS09._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.292404] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.292406] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.292407] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS09._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.292410] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.292411] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.293113] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS10._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.293117] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.293119] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.293120] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS10._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.293122] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.293124] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.293871] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS11._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.293874] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.293876] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.293877] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS11._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.293880] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.293882] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.294528] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS12._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.294531] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.294533] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.294534] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS12._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.294537] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.294539] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.295286] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS13._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.295289] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.295291] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.295292] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS13._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.295295] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.295297] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296046] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS14._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296049] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296051] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296052] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS14._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296055] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296057] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296772] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.USR1._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296776] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296777] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296778] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.USR1._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296781] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296783] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296785] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.USR2._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296788] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296790] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296791] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.USR2._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296793] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296795] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296821] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS01._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296824] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296826] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296827] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS01._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296830] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296831] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296855] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS02._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296858] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296860] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296861] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS02._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296864] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296866] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296889] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS03._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296892] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296894] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296895] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS03._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296898] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296900] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296923] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS04._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296926] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296928] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296929] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS04._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296932] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296934] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296957] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS05._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296960] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296962] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296963] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS05._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296966] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296968] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296991] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS06._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.296994] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.296996] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.296997] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS06._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.297000] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.297002] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.297025] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS07._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.297028] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.297030] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.297031] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS07._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.297034] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.297036] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.297060] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS08._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.297063] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.297064] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.297065] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS08._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.297068] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.297070] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.297094] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS09._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.297097] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.297098] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.297099] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS09._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.297102] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.297104] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.297128] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS10._UPC], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.297131] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.297133] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.297134] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.SS10._PLD], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.297136] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.297138] ACPI: Skipping parse of AML opcode: Method (0x0014)
  [    0.297140] ACPI BIOS Error (bug): Failure creating 
[\_SB.PCI0.XHC.RHUB.HS11.CAMB], AE_ALREADY_EXISTS (20181213/dswload2-324)
  [    0.297143] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog 
(20181213/psobject-221)
  [    0.297145] ACPI: Skipping parse of AML opcode: Device (0x5B82)
  [    0.301048] ACPI: 13 ACPI AML tables successfully acquired and loaded
  [    0.312924] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: xorg 1:7.7+19ubuntu12
  ProcVersionSignature: Ubuntu 5.0.0-7.8-generic 5.0.0
  Uname: Linux 5.0.0-7-generic x86_64
  ApportVersion: 2.20.10-0ubuntu23
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperVersion: 1.402
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Mar 27 09:29:56 2019
  DistUpgraded: Fresh install
  DistroCodename: disco
  DistroVariant: ubuntu
  ExtraDebuggingInterest: No
  GraphicsCard:
   NVIDIA Corporation GP107GLM [Quadro P1000 Mobile] [10de:1cbb] (rev a1) 
(prog-if 00 [VGA controller])
     Subsystem: Dell GP107GLM [Quadro P1000 Mobile] [1028:1889]
  LiveMediaBuild: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190326.2)
  MachineType: Dell Inc. Precision 7530
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz 
file=/cdrom/preseed/username.seed boot=casper quiet splash ---
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/10/2018
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.4.2
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.4.2:bd09/10/2018:svnDellInc.:pnPrecision7530:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct10:cvr:
  dmi.product.family: Precision
  dmi.product.name: Precision 7530
  dmi.product.sku: 0889
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.97-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 19.0.0-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.4-1ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20180925-2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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