ubuntu-x-swat team mailing list archive

[Tom Gelinas <tom.gelinas@xxxxxxxxx>]

** Summary changed:

- Backlight controls on ThinkPad T510 no longer function when using proprietary drivers
+ Backlight controls on ThinkPad T510 and W510 no longer function when using proprietary drivers

** Description changed:

- The brightness controls on this laptop with NVS 3100m work while running
+ The brightness controls on ThinkPad T510s and W510s work  while running
  Nouveau or when using a text mode VT, but not while running X and using
- proprietary NVIDIA drivers. About 3 weeks ago it was possible to force
- the nvidia driver to control the backlight by adding [Option
- "RegistryDwords" "EnableBrightnessControl=1"] to the "Devices" section
- of xorg.conf . While this allowed the backlight to be controlled, the
- increments were inconsistent and resulted in a buzzing noise from the
- LED backlight. Since this did not occur while running nouveau or when
- switching in text VT, something was wrong.
+ proprietary NVIDIA drivers.  It is possible to force the nvidia driver
+ to control the backlight by adding [Option "RegistryDwords"
+ "EnableBrightnessControl=1"] to the "Devices" section of xorg.conf .
+ While this allows the backlight to be controlled, the increments are
+ inconsistent and often result in a buzzing noise from the LED backlight.
+ Since this did not occur while running nouveau or when switching in text
+ VT, something is wrong.
  
- However, adding this option to xorg.conf no longer works. I believe this
- is some type of regression. The ideal solution would be to apply the
- backlight control method used by text VTs to X, because it would work
- around this regression AND prevent the possibly hardware-damaging
- electrical issues caused by the proprietary nvidia driver's forced
- backlight controls (which are not enabled by default).
+ This bad backlight behaviour has been confirmed on ThinkPad models T510 and W510 with NVIDIA NVS 3100m and Quadro FX 880M chipsets, respectively, via http://www.thinkwiki.org/wiki/Category:T510
+ The issue is discussed on the nvnews.net forums at http://www.nvnews.net/vbulletin/showthread.php?t=145105 and http://www.nvnews.net/vbulletin/showthread.php?t=150069 . An NVIDIA developer has said he will investigate the issue.
  
- This bad backlight behaviour has been confirmed on ThinkPad models T510
- and W510 via http://www.thinkwiki.org/wiki/Category:T510 , and I
- mentioned it to a developer on the nvnews.net forums.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: nvidia-current 195.36.15-0ubuntu2
  ProcVersionSignature: Ubuntu 2.6.32-19.28-generic 2.6.32.10+drm33.1
  Uname: Linux 2.6.32-19-generic x86_64
  NonfreeKernelModules: nvidia
  Architecture: amd64
  Date: Mon Apr 12 23:48:02 2010
  DkmsStatus:
   tp-smapi, 0.40, 2.6.32-19-generic, x86_64: installed 
   vboxnetadp, 3.1.6, 2.6.32-19-generic, x86_64: installed 
   vboxnetflt, 3.1.6, 2.6.32-19-generic, x86_64: installed 
   vboxdrv, 3.1.6, 2.6.32-19-generic, x86_64: installed 
   nvidia-current, 195.36.15, 2.6.32-19-generic, x86_64: installed
  EcryptfsInUse: Yes
  GdmLog1:
   
  Lsusb:
   Bus 002 Device 002: ID 8087:0020  
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 003: ID 17ef:480f Lenovo 
   Bus 001 Device 002: ID 8087:0020  
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 4313CTO
  ProcCmdLine: BOOT_IMAGE=/bhostnamet/vmlinuz-2.6.32-19-generic rhostnamet=UUID=0b95b314-337f-49aa-86f9-6423e76e9f20 ro
  ProcEnviron:
   LANG=en_CA.utf8
   SHELL=/bin/bash
  SourcePackage: nvidia-graphics-drivers
  XorgLogOld:
   
  dmi.bios.date: 02/22/2010
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6MET49WW (1.12 )
  dmi.board.name: 4313CTO
  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:bvr6MET49WW(1.12):bd02/22/2010:svnLENOVO:pn4313CTO:pvrThinkPadT510:rvnLENOVO:rn4313CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4313CTO
  dmi.product.version: ThinkPad T510
  dmi.sys.vendor: LENOVO
  system:
   distro:             Ubuntu
   codename:           lucid
   architecture:       x86_64
   kernel:             2.6.32-19-generic

-- 
Backlight controls on ThinkPad T510 and W510 no longer function when using proprietary drivers
https://bugs.launchpad.net/bugs/562005
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