kubuntu 8.1 + nividia 7100 GS + noise on the desktop

[Héder Balázs]

Hi,

I have the following problem with Kubuntu Intrepid:

After a while, which means 1-2 hours of using, my desktop becomes a bit noisy.
There will be millions of little red-yellow flecks on the wallpaper, on the
window borders and on the main panel, i.e. my desktop will be "dotted".

I'm using a PCI-Express Nvidia 7100 GS video card with built-in nvidia-glx-173
driver, but I tried with nvidia-glx-177 driver and the situation was the same.
Desktop effects are switched on, nvidia module is loaded. 

I suspect that there are some incompatibility between KDE 4.1.x and Nvidia 7100
GS, and or between new Xorg and my video card.

As if it matters: the system has been upgraded from Kubuntu Hardy.
Has anybody experienced similar behavior?

Thanks in advance,
Balázs Héder