Originally Posted by logan
Tried Option NoMTRR? (...) Could you revert to an older kernel and/or X?
NoMTRR sounds like it's worth a try... As far as trying older kernels and/or X, everything was working great with a 2.6.24 kernel and whatever version of X shipped with Slackware 11. The problems started when 2.6.25 changes broke compilation of the previous NVIDIA 9x.y.z legacy driver.