Thanks. First, can you please install the newest test driver from
https://wiki.ubuntu.com/XorgOnTheEdge to see if it helps?
Can you switch to a console while the screen is black? Please run:
xrandr -q -d :0 > xrandr.txt
and attach the file xrandr.txt. Please also make a copy of Xorg.0.log at this
point, and then again after logging in, so I can easier see what in the log
corresponds to which state.
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: New => Incomplete
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[hardy] Blank GDM screen with ATI R420 [X800XT PE]
https://bugs.launchpad.net/bugs/177658
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