Same problem with my hp pavillon ze7200 and ATI R100;;;
You can try to create an /etc/X11/xorg.conf with :
Section "Device"
Identifier "Configured Video Device"
Option "DRI" "false"
EndSection
It works for me.
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stellarium crashed with SIGSEGV in radeonPolygonStipplePreKMS()
https://bugs.launchpad.net/bugs/447694
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