Bug#490071: xorg occupies all cpu time
I can reproduce the original report relatively precisely. It appears to
be related to 3D acceleration.
I'm using the most recent packages in Lenny on AMD64, with a PCIE ATI
Radeon X800XT.
Using the default XAA acceleration, not EXA. Start an X session
(without compiz, tested in Gnome and fluxbox) and start
gnome-screensaver-preferences. Click "preview" and cycle back and forth
through the screensavers.. it will pretty quickly hang on a GL
screensaver, but the mouse pointer will still be active (usually the
screensaver draws nothing).
top will show the process for the GL screensaver hack to be taking 100%
of the processor time. Kill that process, then Xorg will take 100% of
the processor time, and cannot be killed.
With EXA, the Xorg process itself will be at 100% utilization and cannot
be killed straight away.
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