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Message #36943
[Bug 969860] Re: fglrx uses 100% CPU when screen turns off (spinning in glXWaitVideoSyncSGI or glXSwapBuffers)
For me changing from the gnome-screensaver to the xscreensaver worked.
I still have around 7% of CPU usage from compiz while the screen is locked, which in my opinion is still a lot for displaying nothing, but at least it consumes less battery on my laptop.
I am running Ubuntu 12.04 on a HP EliteBook 8470p with AMD 7570M
graphics.
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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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References