[Bug 588877] [NEW] Thinkpad T510 display brightness can't be changed

[Philip Muškovac]

Public bug reported:

The Hotkeys work fine and the value in
/proc/acpi/video/VID1/LCD0/brightness 
can be changed fine, but the display brightness stays at 100%.

dmesg shows:
[   14.757864] thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver
[   14.757865] thinkpad_acpi: Disabling thinkpad-acpi brightness events by default...

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.34-5-generic 2.6.34-5.13
Regression: No
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.34-5.13-generic 2.6.34
Uname: Linux 2.6.34-5-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.22.1.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: HDA Generic [HDA Generic]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf2420000 irq 32'
   Mixer name	: 'Conexant ID 5069'
   Components	: 'HDA:14f15069,17aa218b,00100302'
   Controls      : 6
   Simple ctrls  : 4
Card1.Amixer.info:
 Card hw:1 'NVidia'/'HDA NVidia at 0xcdefc000 irq 16'
   Mixer name	: 'Nvidia GT21x HDMI'
   Components	: 'HDA:10de000b,10de0101,00100100'
   Controls      : 16
   Simple ctrls  : 4
Card29.Amixer.info:
 Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 6MHT35WW-1.10'
   Mixer name	: 'ThinkPad EC 6MHT35WW-1.10'
   Components	: ''
   Controls      : 1
   Simple ctrls  : 1
Card29.Amixer.values:
 Simple mixer control 'Console',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [off]
Date: Wed Jun  2 20:47:47 2010
HibernationDevice: RESUME=UUID=625759c5-c92f-456d-86d4-df014615c223
InstallationMedia: Kubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100427.1)
MachineType: LENOVO 4349W1R
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.34-5-generic root=UUID=66934ff0-c70a-465d-a34d-24aca2ab5e96 ro quiet splash
ProcEnviron:
 LANGUAGE=en_US.UTF-8
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.35
SourcePackage: linux
dmi.bios.date: 04/21/2010
dmi.bios.vendor: LENOVO
dmi.bios.version: 6MET55WW (1.18 )
dmi.board.name: 4349W1R
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr6MET55WW(1.18):bd04/21/2010:svnLENOVO:pn4349W1R:pvrThinkPadT510:rvnLENOVO:rn4349W1R:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4349W1R
dmi.product.version: ThinkPad T510
dmi.sys.vendor: LENOVO

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


** Tags: amd64 apport-bug maverick needs-upstream-testing resume suspend

-- 
Thinkpad T510 display brightness can't be changed
https://bugs.launchpad.net/bugs/588877
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