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I've already tried to follow literally everything on ask ubuntu and similar websites but still I cannot manage my graphic card:

  • If I look under system settings "Graphics", Ubuntu seems unable to recognize any kind of graphic device (not even intel) since it says: "Driver Unknown"
  • Under the tab "proprietary drivers" of the software center it is listed only the Broadcom card, but not nvidia.
  • Still, if I run

    lspci| grep VGA
    

    the system returns:

    00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated
    Graphics Controller (rev 02)
    01:00.0 VGA compatible controller: NVIDIA Corporation GF108 [GeForce GT 540M]
    (rev a1)
    

    so the system knows that the graphic cards are there.

  • I've already tried (after the installation of the kernel source and headers using -$(uname -r) to avoid problems) to install the bumblebee repositories and then the nvidia drivers, but still if I run:

    optirun glxspheres    
    

    the system returns:

    [ 3740.367448] [ERROR]Cannot access secondary GPU - error: Could not load GPU
    driver
    [ 3740.367550] [ERROR]Aborting because fallback start is disabled.
    

I'm frankly bewildered and frustrated: what can I do or check now?

share|improve this question
    
Have you tried rebooting? –  Lekensteyn Jan 13 '13 at 21:02
    
yes, that's the result: [ 296.503050] [ERROR]Cannot access secondary GPU - error: [XORG] (EE) Failed load module "nvidia" (module does not exit, 0) –  Mutewinter Jan 13 '13 at 21:29
    
Ensure that you have the headers package installed, see askubuntu.com/a/36936/6969. If you have also installed drivers other than nvidia-current (e.g. nvidia-current-updates), you also need to edit /etc/bumblebee/bumblebee.conf to reflect those changes. If you do not know what you are doing, just uninstall all nvidia-experimental and nvidia-current-updates packages and still to nvidia-current from ubuntu-x-swat/x-updates as described in the link. –  Lekensteyn Jan 13 '13 at 21:35
    
I installed headers using: $(sudo apt-get install linux-headers-$(uname -r)) how do I check if they're correctly installed? I also tried, as @Lekensteyn suggested to uninstall all nvidia-experimental and nvidia-current-updates and then reinstall nvidia-current (but from Bumblebee since under ubuntu-x-swat/x-updatesd it didn't found any nvidia package) using $(sudo apt-get install bumblebee nvidia-current) The situation worsened: after reboot the desktop was not showing, compiz was not working and "Graphics" still told "Drivers: Unknown" –  Mutewinter Jan 14 '13 at 16:18
    
You need to install both the bumblebee/stable and ubuntu-x-swat/x-updates PPAs. Remember to reinstall bumblebee-nvidia after installing nvidia-current. Something like sudo apt-get purge nvidia-current nvidia-current-updates nvidia-experimental-* bumblebee-nvidia && sudo apt-get install bumblebee-nvidia –  Lekensteyn Jan 14 '13 at 20:32

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