Have you seen any errors in your /var/log/Xorg.0.log or /var/log/ Xorg.0.log that could give you a hint at what could be the problem?
________________________________
From: Derek Trotter <
expat.arizonan@gmail.com>
To:
plug-discuss@lists.plug.phoenix.az.us
Sent: Thursday, November 10, 2011 3:59 PM
Subject: Possible ubuntu video driver bug
I have an NVIDIA Geforce 8400 GS card that plugs into a PCI slot. I have no problems with it in XP, but when I installed Kubuntu 11.10 I found a problem. Occasionally the screen freezes. I can't switch to a console. Also I can't kill the x server. I know the machine has not completely locked up because when I have audio playing, it keeps playing even though the screen has frozen. None of the usual means to shut down a machine work. The only thing I can do is hit the reset button, press the power switch for several seconds until the machine shuts off, or pull the plug. I've encountered this on Ubuntu 11.10, Kubuntu 11.10, Mepis 11 and Fedora 15. I installed the LTS verson of Kubuntu 10 and haven't had any problems with it. Does anyone have any idea what's going on or how to fix it?
Thanks
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