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Toshiba Tecra 8000, NeoMagic chipset, in 640x480 mode (which is all I have working so far, yuk! see bug #6971). Any horizontal motion of a GNOME window causes great redrawing confusion. The left or right edge and the first few columns inward of it get repeated many times, covering the window's normal contents. Exposing the window while stationary brings the contents back. Sometimes only alternate lines are affected, giving an interlaced look. Text (terminal, emacs) windows do not have the problem. Possibly related, the GNOME help browser text does not usually redraw if covered by another window and the uncovered. If I scroll fast, it redraws, but not if scrolled slowly. Not sure if this is a server bug or not, but I tend to think that if it was a help browser bug they'd have seen it in testing.
I just got 1024x768 pixel mode working and the problem persists. It wasn't a problem in the servers from RH5.2, though there were considerable, similar problems in true-color mode under that release, which I reported (with minimal interest on their part) to Precision Insight. --jh--
the driver may continue to have problems, and unfortunately there isn't much active work going on on the NeoMagic chipset. I have noted to take this up with Precision Insight though. I suggest you look at http://www.xfree86.org/3.3.5/neo6.html#6 which has some info about NeoMagic chipset options. Some might help you.