** 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 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
