After having installed Ubuntu 14.10 freshly, I still have the same error that I already had in 14.04 and 12.04. The desktop sometimes just freezes. To use the desktop again I press Ctrl+Alt+F8 and then Ctrl+Alt+F7 to basically reload the desktop. I tried around a bit, installing Unity, KDE4, Gnome 3, Mate, Cinnamon, xfce, and I get the same error with all desktops. I still can continue my work, but it is truely annoying and I believe I am not the only one out there having this problem.

I already did some research, but have not found anything helpful.

My laptop is a Dell XPS with a Intel(R) Core(TM) i7-2630QM CPU and an NVIDIA GF116M [GeForce GT 555M/635M].

Is anybody familiar with this apparent bug?


The output of lspci -nnk | grep -iA2 VGA is:

00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09)
        Subsystem: Dell Device [1028:0571]
        Kernel driver in use: i915
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GF116M [GeForce GT 555M/635M] [10de:124d] (rev a1)
        Subsystem: Dell GeForce GT 555M [1028:0571]
        Kernel driver in use: nvidia
  • 2
    are you using proprietary driver? add the output lspci -nnk | grep -iA2 VGA – JoKeR Feb 24 '15 at 16:57
  • I used the recommended driver that is offered after the installation by the desktop environment. (Edit above) – Socrates Feb 24 '15 at 20:28
  • run in terminal prime-select nvidia and then prime-select query to check if it says nvidia and reply. Also you might wanna look here wiki.ubuntu.com/Bumblebee – JoKeR Feb 24 '15 at 20:43
  • I think you're correct to suspect something hardware/graphics driver related since the bug shows up in different OS versions. Apparently you have a hybrid graphics system with an Intel and an Nvidia GPU. You might want to try the Bumblebee Project: wiki.ubuntu.com/Bumblebee – atmelino Feb 24 '15 at 21:02
  • Thank you @JohnnyEnglish and atmelino for your answers. Bumblebee provided the answer to me. I answered to my posting and will mark it as the adequate answer in 17h from now on. – Socrates Feb 25 '15 at 23:51

The solution to this problem is in wiki.ubuntu.com/Bumblebee.

Easily done by running the following command:

sudo apt-get install bumblebee bumblebee-nvidia primus linux-headers-generic
sudo reboot
  • Had same issue with propiertary drivers. Bumblebee did the trick. Install primus aswell.. – aXept Feb 25 '15 at 23:54

I had a similar problem and searching on google I found that was due to multiple nvidia driver versions installed. Unfortunately I didn't find the thread, but it was something close to Nvidia proprietary driver hangs/freezes/blank screen at login in 13.10

I downloaded the right driver from the Nvidia website, then I removed all the nvidia drivers installed on my system, reboot, got a console and installed the driver just downloaded. Perhaps you should even reinstall the kernel package after installing the nvidia driver

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