For my future reference, and possibly others: After installing Xubuntu 14.04 on my Thinkpad W510, generating /etc/X11/xorg.conf with nvidia-settings and adding the EnableBrightnessControl line to the Devices section and rebooting did not work (it worked in Xubuntu 12.10). Instead, I had to create a /usr/share/X11/xorg.conf.d/10-nvidia-brightness.conf file and add the Devices section to that. It's described in this blog post:
http://blog.pearce.org.nz/2012/08/enabling-external-monitor-on- lenovo.html You should probably change the BoardName to whatever it is for your system (mine is "Quadro FX 880M"). -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to nvidia-graphics-drivers in Ubuntu. https://bugs.launchpad.net/bugs/562005 Title: Backlight controls of laptops with NVIDIA NVS and Quadro FX 880M GPUs no longer function while using proprietary drivers Status in Ubuntu Certification Programme: Invalid Status in “nvidia-graphics-drivers” package in Ubuntu: Confirmed Bug description: The brightness controls of laptops with NVIDIA NVS 3100M or Quadro FX 880M GPUs work while running Nouveau or when using a text mode VT, but not while running X and using 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 on Lenovo ThinkPad T510s and W510s. Since this did not occur while running nouveau or when switching in text VT, something is wrong. 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 Because this issue is related to NVIDIA's proprietary video driver, this issue can only be solved by them. An NVIDIA developer has said he will investigate the issues, which are 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 . For future reference, the latest NVIDIA drivers can be found in the Ubuntu X-Swat X updates PPA: https://launchpad.net/~ubuntu-x-swat/+archive/x-updates 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: nvidia-current, 195.36.15, 2.6.32-19-generic, x86_64: installed EcryptfsInUse: Yes GdmLog1: 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 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.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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-certification/+bug/562005/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
