ubuntu-x-swat team mailing list archive

[Tom Gelinas <tom.gelinas@xxxxxxxxx>]

Public bug reported:

The brightness controls on this laptop with NVS 3100m 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.

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 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

** Affects: nvidia-graphics-drivers (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: backlight lenovo nvidia proprietary t510 thinkpad vt w510 xorg

-- 
Backlight brightness on ThinkPad T510 can only be changed in Text Mode, not X
https://bugs.launchpad.net/bugs/562005
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