Try looking to see if you are using the open source generic nvidia driver or the proprietary one.  I am not sure where that is in the Kubuntu menus but look for something in System, or Administration with a name that is probably something about Hardware.  It should run a program that looks to see if there are proprietary drivers you might choose to use.

I AM curious though if you have some particular reason for suspecting it is due to you having that video card since a screen freeze could be something above the driver level.

On Thu, Nov 10, 2011 at 3:59 PM, Derek Trotter <expat.arizonan@gmail.com> wrote:
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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Dazed_75 a.k.a. Larry

The spirit of resistance to government is so valuable on certain occasions, that I wish it always to be kept alive.
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