I also encounter this bug, in fact, it exists at both 8.04 and 9.10 at
least. The kernel may hang up randomly forever (I can not switch the
caplock/Numlock light, and Ctrl-Alt-Delete has not effect at all), I
tried to use vesa driver, ubuntu packaged fglrx driver, and downloaded
driver from ATI
And, before hangup, the screen may be tiled with some random colored
rectangle (but all rectangles keep same pattern in each time), or LCD
lost any signals
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Screen randomly turns black with Ati Xpress 1100 graphics card
https://bugs.launchpad.net/bugs/191733
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