I used Nvidia in the discreet mode (BIOS switch) with 12.04. I never
installed bumblebee. I upgraded to 14.04; nvidia-prime was installed
automatically and I was able to switch to Intel in Nvidia Settings. I
logged out, logged in again and Intel worked. I used Nvidia Settings
again to switch back to Nvidia and got the empty error message too. The
following commands didn't help - I still see the empty message and
cannot switch back to Nvidia...
sudo apt-get purge libvdpau-va-gl1 bumblebee* nvidia* bbswitch-dkms
sudo apt-get install nvidia-331 nvidia-settings nvidia-prime bbswitch-dkms
The /var/log/gpu-manager.log contains:
Is nvidia loaded? no
Was nvidia unloaded? no
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https://bugs.launchpad.net/bugs/1309773
Title:
Nameless error when switching to NVidia graphics card from Nvidia
settings using PRIME profiles on Lenovo IdeaPad y580
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/nvidia-prime/+bug/1309773/+subscriptions
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