I had a similar problem with drivers 8.24 through 8.27. Roughly one in three
logouts, the screen would turn completely white. At that point,
Ctrl-Alt-Backspace crashed the computer. After commenting out in xorg.conf:
#Option "VideoOverlay" "on"
#Option "OpenGLOverlay" "off"
it seems to work fine. :-)
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Lockup problems with both the free xorg ATI driver and the proprietary fglrx
driver, using various ATI cards
https://launchpad.net/bugs/30447
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