Weirdly, this bug does not happen if I turn the screen off using:
xset dpms force off
But it does still happen if I let the gnome screensaver kick in and turn the
monitor off.
Does that mean it's a problem specifically with ACPI? It doesn't happen
with DPMS.
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https://bugs.launchpad.net/bugs/969860
Title:
fglrx uses 100% CPU when screen turns off (spinning in
glXWaitVideoSyncSGI or glXSwapBuffers)
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