Public bug reported:
After recent updates, the backlight doesn't work after suspend on my
Asus UX32VD laptop. The hotkeys work as far as the Unity graphical
indicator goes, but there is no change in backlight. The hotkeys used to
work, and have worked for the last couple of years.
Backlight is restored and does work after restarting, but can no longer
be modified after suspend.
This is the output from
ls /sys/class/backlight > backlight
"acpi_video0
acpi_video1
intel_backlight"
This is the output from
grep -r . /proc/acpi > acpi
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-39-generic 3.13.0-39.66
ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
Uname: Linux 3.13.0-39-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: rasmus 2439 F.... pulseaudio
/dev/snd/pcmC0D0p: rasmus 2439 F...m pulseaudio
CurrentDesktop: Unity
Date: Wed Nov 12 08:22:20 2014
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=49ecb728-6268-4421-9baf-b50a95225410
InstallationDate: Installed on 2012-08-10 (823 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120425)
MachineType: ASUSTeK COMPUTER INC. UX32VD
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-39-generic
root=UUID=8f94976f-77a4-4e28-a0a8-2e0ce9149ef8 ro quiet splash pcie_aspm=force
vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.13.0-39-generic N/A
linux-backports-modules-3.13.0-39-generic N/A
linux-firmware 1.127.8
SourcePackage: linux
StagingDrivers: rts5139
UpgradeStatus: Upgraded to trusty on 2014-05-31 (164 days ago)
dmi.bios.date: 06/06/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: UX32VD.206
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: UX32VD
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvrUX32VD.206:bd06/06/2012:svnASUSTeKCOMPUTERINC.:pnUX32VD:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX32VD:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.name: UX32VD
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: amd64 apport-bug staging trusty
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https://bugs.launchpad.net/bugs/1391758
Title:
[Asus UX32VD] Backlight controls have no effect after suspend in most
recent kernel
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