I have a dell e1705 i have a radeon mobility x1400 video card.
i have random lockups and freezes, where only the mouse works. also the black 
screen with no mouse, for the most part i have been able to restart with the 
alt+SysRq REIUB. 
and not sure if it's related but when i try to run x-plane it start's up runs, 
then just disappears completely, and i'm back at the desktop. if there is any 
info i can provide that will help please let me know.

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[RV250] Kubuntu: X Freezes with Radeon driver EXA/XAA Composite
https://bugs.launchpad.net/bugs/348332
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which is subscribed to xserver-xorg-video-ati in ubuntu.

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