I had the same problem on ATI Radeon 9200 PRO. Disable Option
EnablePageFlip in Device Section in /etc/X11/xorg.conf fix it. It should
looks like this

Section "Device"
        Identifier "Device0"
        Driver "radeon"
        Option "EnablePageFlip" "off"
EndSection

Or just comment out or remove the line, becose disable is the default
value for radeon driver.

-- 
Stelaium crashes on startup due to fragmentation fault
https://bugs.launchpad.net/bugs/481669
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