I have exactly the same problem, since Edgu and Dapper, and now also in
Feisty and Gutsy: colour corruption, even with entire regions of the
screen altered (as, for example, in the Kubuntu startup screen), and
also some strange moving dots/patterns surrounding objects such as
buttons, for example: well, it's quite difficult to describe it exactly.

Howevere, if one changes the screen resolution forth and back again
(e.g., from 1280x1024 to 1024x768 and then again to 1280x1024, with the
Screen Resolution control panel or by launching a game (Planet Penguin
Racer, for example) which changes the resolution), then everything
(re)turns normal, with exact colours and no disturbances.

My hardware is an upgraded Power Mac G4 AGP, with a Radeon 9000 Pro Mac
Edition video card and a LaCie photon18blue monitor, connected through
DVI.

BTW, could it maybe be caused by the DVI-only conncetion? Or could it be
a PPC-only problem? Who knows...

-- 
[PPC/r200] X11 color corruption on a radeon 9000 mac edition
https://bugs.launchpad.net/bugs/35724
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