Public bug reported:
CID: 201408-15450 Inspiron 7548
Brightness control does not work on this system with 14.04.1
The brightness level indicator would change with hotkey events, but the
brightness itself does not.
Debugging information:
root@201408-15450:~$ ls /sys/class/backlight
acpi_video0 intel_backlight
root@201408-15450:~$ grep -r . /proc/acpi
/proc/acpi/battery/BAT0/alarm:alarm: unsupported
/proc/acpi/battery/BAT0/state:present: yes
/proc/acpi/battery/BAT0/state:capacity state: ok
/proc/acpi/battery/BAT0/state:charging state: charging
/proc/acpi/battery/BAT0/state:present rate: 474 mA
/proc/acpi/battery/BAT0/state:remaining capacity: 3811 mAh
/proc/acpi/battery/BAT0/state:present voltage: 13006 mV
/proc/acpi/battery/BAT0/info:present: yes
/proc/acpi/battery/BAT0/info:design capacity: 3900 mAh
/proc/acpi/battery/BAT0/info:last full capacity: 3900 mAh
/proc/acpi/battery/BAT0/info:battery technology: non-rechargeable
/proc/acpi/battery/BAT0/info:design voltage: 11400 mV
/proc/acpi/battery/BAT0/info:design capacity warning: 390 mAh
/proc/acpi/battery/BAT0/info:design capacity low: 0 mAh
/proc/acpi/battery/BAT0/info:cycle count: 0
/proc/acpi/battery/BAT0/info:capacity granularity 1: 100 mAh
/proc/acpi/battery/BAT0/info:capacity granularity 2: 0 mAh
/proc/acpi/battery/BAT0/info:model number: Dell
/proc/acpi/battery/BAT0/info:serial number: 480
/proc/acpi/battery/BAT0/info:battery type: LION
/proc/acpi/battery/BAT0/info:OEM info: SIMPLO
/proc/acpi/button/lid/LID0/state:state: open
/proc/acpi/ac_adapter/ADP1/state:state: on-line
/proc/acpi/wakeup:Device S-state Status Sysfs node
/proc/acpi/wakeup:RP01 S4 *disabled pci:0000:00:1c.0
/proc/acpi/wakeup:PXSX S4 *disabled
/proc/acpi/wakeup:RP04 S4 *disabled pci:0000:00:1c.3
/proc/acpi/wakeup:PXSX S4 *disabled pci:0000:07:00.0
/proc/acpi/wakeup:RP05 S4 *disabled pci:0000:00:1c.4
/proc/acpi/wakeup:PXSX S4 *disabled
/proc/acpi/wakeup:EHC1 S0 *enabled pci:0000:00:1d.0
/proc/acpi/wakeup:XHC S0 *enabled pci:0000:00:14.0
/proc/acpi/wakeup:HDEF S4 *disabled pci:0000:00:1b.0
/proc/acpi/wakeup:LID0 S3 *enabled
root@201408-15450:~$ dmesg | grep 'ACPI: Video'
[ 2.843516] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no)
root@201408-15450:~$
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-43-generic 3.13.0-43.72
ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
Uname: Linux 3.13.0-43-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: ubuntu 1512 F.... pulseaudio
/dev/snd/controlC0: ubuntu 1512 F.... pulseaudio
CRDA:
country TW:
(2402 - 2472 @ 40), (3, 27)
(5270 - 5330 @ 40), (3, 17), DFS
(5735 - 5815 @ 40), (3, 30)
CurrentDesktop: Unity
Date: Mon Jan 5 04:10:59 2015
HibernationDevice: RESUME=UUID=87828d2c-0d30-454b-90f1-ed89c2790e76
InstallationDate: Installed on 2015-01-05 (0 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: Dell Inc. Inspiron 7548
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-43-generic.efi.signed
root=UUID=4cf32401-def5-4cf9-a237-f0bfb729a6cc ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.13.0-43-generic N/A
linux-backports-modules-3.13.0-43-generic N/A
linux-firmware 1.127.10
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/19/2014
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A00
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias:
dmi:bvnDellInc.:bvrA00:bd11/19/2014:svnDellInc.:pnInspiron7548:pvrA00:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvrNotSpecified:
dmi.product.name: Inspiron 7548
dmi.product.version: A00
dmi.sys.vendor: Dell Inc.
** Affects: linux (Ubuntu)
Importance: Medium
Assignee: Anthony Wong (anthonywong)
Status: New
** Tags: 201408-15450 amd64 apport-bug blocks-hwcert taipei-lab trusty
** Attachment added: "dmidecode.log"
https://bugs.launchpad.net/bugs/1407604/+attachment/4292272/+files/dmidecode.log
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https://bugs.launchpad.net/bugs/1407604
Title:
[Dell Inspiron 7548] Brightness control does not work on 14.04.1
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