Yes, when the display turns off sometimes it cannot be turned back on.
Instead of restarting I do something like: Ctrl+Alt+F1 and then back
Alt+F7 (or wherever your X is). That turns the display back on when
it's stuck. This is surely a bug and it appeared with older versions
of the Nvidia driver. Now it's back on the stage if it had ever been
fixed at all.



On Tue, Oct 26, 2010 at 4:44 AM, Jon Packard <email address hidden> wrote:
> I just did a fresh install of Maverick 64-bit on my HP EliteBook 8440p
> with NVS 3100m graphics. I still had to use "nomodeset" to install and
> to boot thereafter, but that's not an issue. After installing the nVidia
> proprietary drivers, I found that whenever my notebook tries to power
> its screen off, it gets stuck as black and has to be restarted to fix.
> The computer is still responsive, since I can ctrl-alt-del, enter, tab,
> enter to poweroff. I have tried adding the [Option  "RegistryDwords"
> "EnableBrightnessControl=1"] line to the device section of my xorg.conf
> and rebooting, just as I did in Lucid. Unlike in Lucid, this did not
> resolve my issue. My nvidia driver version is 260.19.06-0ubuntu1. Could
> anyone please suggest any workarounds I could try? I can suspend just
> fine, but I often like to shut my screen and let my notebook continue
> working. Thank you in advance.
>
> --
> Backlight controls of laptops with NVIDIA NVS and Quadro FX 880M GPUs no longer function while using proprietary drivers
> https://bugs.launchpad.net/bugs/562005
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> 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 unsubscribe from this bug, go to:
> https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/562005/+subscribe
>