Incorrectly detected Video RAM and Instability
I'm running the nVidia driver 1.0-8776 on Kubuntu 6.10 (kernel 2.6.17) on an Athlon X2. The NVIDIA X Server Settings application reports 256 MB of video memory. This is surprising because the onboard 6150 may be allocated either 64 MB or 128 MB through the BIOS. Is this a problem?
I have also, sporadically, had a problem where I will be using the computer, and suddenly the video display will become "garbage". Garbage is here defined as a tiling, roughly 100 pixels tall and not evenly dividing 1920 (the display width), because subsequent rows of the tiling are not aligned. The garbage is roughly in the same color scheme as the desktop, but is totally randomized pixels. Is this related to the mismatch between reported and allocatable video RAM?
Sometimes, I can go weeks without video corruption striking. I suspect that it is a complicated coincidence of increased system usage, using a dual core processor, and the memory mismatch above. I haven't had an incidence since a batch of upgrades about 2-3 weeks ago, so the problem may have been resolved with a kernel or driver update at that time. However, I've had quiescent periods of several weeks before, so I'm not entirely convinced that my troubles are past.
Nevertheless, is there a problem indicated by the memory mismatch and is there something I can/should do about it?