Can you please create an /etc/X11/xorg.conf with these contents and see
if it works around the problem?
Section "Device"
Identifier "Default Device"
Driver "radeon"
Option "EnablePageFlip" "False"
EndSection
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which is subscribed to xserver-xorg-video-ati in ubuntu.
https://bugs.launchpad.net/bugs/725580
Title:
black screen on boot on radeon 9200
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