Matthew, the next step is to fully commit bisect from kernel 3.13 to 4.4
in order to identify the last good kernel commit, followed immediately
by the first bad one. This will allow for a more expedited analysis of
the root cause of your issue. Could you please do this following
https://wiki.ubuntu.com/Kernel/KernelBisection ?
Please note, finding adjacent kernel versions is not fully commit
bisecting.
Also, the kernel release names are irrelevant for the purposes of
bisecting.
It is most helpful that after the fix commit (not kernel version) has
been identified, you then mark this report Status Confirmed.
Thank you for your help.
** Tags added: kernel-bug-exists-upstream-4.8-rc4
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1608745
Title:
Backlight uncontrollable on Samsung NP740UE3 since upgrade to Xenial
Status in linux package in Ubuntu:
Incomplete
Bug description:
Stopped working since I upgraded from 14.04 to 16.04 - now stuck at
full brightness. The only subdirectory in /sys/class/backlight is
intel_backlight and while the function keys control the value in
actual_brightness it has no effect.
If I boot with the previous kernel (3.13.0-34) there are two more
subdirectories: acpi_video0 and acpi_video0. Either of these can be
used to control the brightness by writing to the brightness entry,
though the function keys no longer control it because they change
values in intel_backlight instead.
If I give the Xenial kernel the parameter acpi_backlight=video, those
two subdirectories also appear and are controllable, though the
function keys still try to control intel_backlight.
Seems to be similar to
https://bugzilla.kernel.org/show_bug.cgi?id=108971. From that I have
tried acpi_backlight=native and acpi_backlight="!Windows 2012" and
neither has any effect, nor does video.use_bios_initial or
acpi_osi=Linux.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-31-generic 4.4.0-31.50
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: matthew 3526 F.... pulseaudio
CurrentDesktop: Unity
Date: Tue Aug 2 01:41:24 2016
HibernationDevice: RESUME=UUID=0adbc2db-fe30-4c7e-9189-6e241093a9db
MachineType: SAMSUNG ELECTRONICS CO., LTD. 740U
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-31-generic
root=UUID=11a96955-be22-4e0d-ba57-9da738ace79d ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-4.4.0-31-generic N/A
linux-backports-modules-4.4.0-31-generic N/A
linux-firmware 1.157.2
SourcePackage: linux
UpgradeStatus: Upgraded to xenial on 2016-08-01 (0 days ago)
dmi.bios.date: 02/26/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P07ABW.065.140226.dg
dmi.board.asset.tag: No Asset Tag
dmi.board.name: NP740U3E-S02UK
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: SEC_SW_REVISION_1234567890ABCD
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: N/A
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvrP07ABW.065.140226.dg:bd02/26/2014:svnSAMSUNGELECTRONICSCO.,LTD.:pn740U:pvrNP740U3E-S02UK:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP740U3E-S02UK:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
dmi.product.name: 740U
dmi.product.version: NP740U3E-S02UK
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
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