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I am on a fresh install of 12.04, and my video card is a Quadro FX 570, which appears to be supported (see output of unity_support_test below). But my Xserver crashes randomly and causes my session to just shutdown and bring me back to the logging screen. This happens several times per hour.

After checking syslog it that a segfault in the nvidia driver is the cause of the problem:

Jun 13 11:14:17 lima kernel: [86569.828982] Xorg[17940]: segfault at ffebeb69 ip b4c8f7aa sp bf8076dc error 4 in nvidia_drv.so[b47a7000+706000]
Jun 13 11:14:36 lima gnome-session[18119]: Gdk-WARNING: gnome-session: Fatal IO error 11 (Ressource temporairement non disponible) on X server :3.#012

The funny thing is that as I was reporting this bug, my xserver crashed again (!) and this time I got another error message:

Jun 13 11:29:39 lima kernel: [87491.106441] NVRM: Xid (0000:02:00): 6, PE0001
Jun 13 11:29:39 lima gnome-session[26493]: Gdk-WARNING: gnome-session: Fatal IO error 11 (Ressource temporairement non disponible) on X server :4.#012

Any idea as to what can be the problem given that i am on a fresh install with a supported video card?

This is the output of unity_support_test:

$ /usr/lib/nux/unity_support_test -p 
OpenGL vendor string:   NVIDIA Corporation
OpenGL renderer string: Quadro FX 570/PCIe/SSE2
OpenGL version string:  3.3.0 NVIDIA 295.40

Not software rendered:    yes
Not blacklisted:          yes
GLX fbconfig:             yes
GLX texture from pixmap:  yes
GL npot or rect textures: yes
GL vertex program:        yes
GL fragment program:      yes
GL vertex buffer object:  yes
GL framebuffer object:    yes
GL version is 1.4+:       yes

Unity 3D supported:       yes
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closed as off topic by Lekensteyn, fossfreedom Jun 16 '12 at 10:47

Questions on Ask Ubuntu are expected to relate to Ubuntu within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.

    
Welcome to Ask Ubuntu! This question should instead be filed as a bug report, and as such is off-topic, thanks! Instructions on filing a bug report are here. –  fossfreedom Jun 16 '12 at 10:47
    
Downgrade to 290.10 until they fix this, monitor nvnews.net/vbulletin/showthread.php?t=176404 –  Tom Wijsman Aug 12 '12 at 22:30
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