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I've seen a lot of people in this situation, but every time the variables differ and so does the solution for it.

I think I have everything installed correctly. I have Nvidia GeForce 540M with Bumblebee drivers installed.

What happens is, every two times when Ubuntu starts it tells me it is running in low-end graphics mode. I say OK and it crashes at the next window. I just restart and it starts normally.

I've made:

lspci -nn | grep '\[030[02]\]:

and the answer was:

00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09)
01:00.0 3D controller [0302]: NVIDIA Corporation GF108 [GeForce GT 540M] [10de:0df4] (rev ff)
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How have you installed nvidia drivers? – Salem Oct 25 '12 at 17:37

I do not have an answer but I have the same problem and cannot find a reasonable answer. I have installed a fresh ubuntu 12.10. Then I installed bumblebee with these commands like everybody else would have:

first the required kernel headers: sudo apt-get install linux-headers-3.5.0-18-generic

then bumblebee: sudo add-apt-repository ppa:bumblebee/stable sudo apt-get update sudo apt-get install linux-headers-3.5.0-17-generic

Everythings works except that every few boot ups it gets into this "low graphics mode". As is described above it hangs after the next screen.

When going in another console ctrl-alt-f1 I can login and reboot. After the reboot most of the times everything starts just fine. More then strange to me... It is like a random error.

The tail of my Xorg.log.old says these errors when the failure accurs: [ 2.474] (EE) intel(0): [drm] Failed to open DRM device for pci:0000:00:02..0: No such file or directory [ 2.474] (EE) intel(0): Failed to become DRM master. [ 2.474] (II) UnloadModule: "intel" [ 2.474] (EE) Screen(s) found, but none have a usable configuration. [ 2.474] Fatal server error: [ 2.474] no screens found [ 2.474] (EE)

Hopefully this helps you pro's to find an answer.

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At the interface which have "low graphics mode", press Ctrl+Alt+F1. After login, input:

sudo service lightdm restart  

and it will go in to x window. Input:

sudo apt-get install gdm  

and choose gdm later. This method is using gdm to replace lightdm. Reboot.

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