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Message #63554
[Bug 1324529] Re: Backlight not adjustable
Eli Fox-Epstein, if you remove all non-default kernel boot parameters
(ex. nomodeset video.use_native_backlight=1) does this change anything?
** Tags added: bios-outdated-2.60
** Changed in: linux (Ubuntu)
Importance: Medium => Critical
** Changed in: linux (Ubuntu)
Importance: Critical => Low
** Summary changed:
- Backlight not adjustable
+ [Lenovo ThinkPad T530] Backlight not adjustable
** Tags added: regression-release
** Tags added: needs-utopic-test
--
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https://bugs.launchpad.net/bugs/1324529
Title:
[Lenovo ThinkPad T530] Backlight not adjustable
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
Running 14.04, just upgraded. I can no longer adjust my backlight on
my ThinkPad T530. I am attaching a number of files as requested in
https://wiki.ubuntu.com/Kernel/Debugging/Backlight. See also:
http://askubuntu.com/questions/473660/brightness-keys-no-longer-work
Note that /sys/class/backlight is empty unless acpi_backlight=vendor
is set.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-27-generic 3.13.0-27.50
ProcVersionSignature: Ubuntu 3.13.0-27.50-generic 3.13.11
Uname: Linux 3.13.0-27-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: eli 3150 F.... pulseaudio
CurrentDmesg: Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
Date: Thu May 29 08:43:12 2014
InstallationDate: Installed on 2012-11-02 (572 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MachineType: LENOVO 2359CTO
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-27-generic root=UUID=4666fbf8-118b-4336-bc4b-54c0e7dfd118 ro nosplash nomodeset video.use_native_backlight=1
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
UpgradeStatus: Upgraded to trusty on 2014-05-25 (3 days ago)
WifiSyslog:
dmi.bios.date: 09/13/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: G4ET62WW (2.04 )
dmi.board.asset.tag: Not Available
dmi.board.name: 2359CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrG4ET62WW(2.04):bd09/13/2012:svnLENOVO:pn2359CTO:pvrThinkPadT530:rvnLENOVO:rn2359CTO:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2359CTO
dmi.product.version: ThinkPad T530
dmi.sys.vendor: LENOVO
---
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: eli 3150 F.... pulseaudio
/dev/snd/pcmC0D0p: eli 3150 F...m pulseaudio
/dev/snd/timer: eli 3150 f.... pulseaudio
CurrentDmesg:
Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
dmesg: write failed: Broken pipe
DistroRelease: Ubuntu 14.04
InstallationDate: Installed on 2012-11-02 (572 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MachineType: LENOVO 2359CTO
Package: linux 3.11.0.20.21 [origin: unknown]
PackageArchitecture: amd64
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-27-generic root=UUID=4666fbf8-118b-4336-bc4b-54c0e7dfd118 ro nosplash nomodeset video.use_native_backlight=1
ProcVersionSignature: Ubuntu 3.13.0-27.50-generic 3.13.11
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
Tags: trusty third-party-packages
Uname: Linux 3.13.0-27-generic x86_64
UnreportableReason: This is not an official Ubuntu package. Please remove any third party package and try again.
UpgradeStatus: Upgraded to trusty on 2014-05-25 (3 days ago)
UserGroups: bumblebee lpadmin sudo vboxusers
WifiSyslog:
_MarkForUpload: True
dmi.bios.date: 09/13/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: G4ET62WW (2.04 )
dmi.board.asset.tag: Not Available
dmi.board.name: 2359CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrG4ET62WW(2.04):bd09/13/2012:svnLENOVO:pn2359CTO:pvrThinkPadT530:rvnLENOVO:rn2359CTO:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2359CTO
dmi.product.version: ThinkPad T530
dmi.sys.vendor: LENOVO
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