ive bisected to this commit: http://git.kernel.org/?p=linux/kernel/git/airlied/drm-2.6.git;a=commitdiff;h=8b8d01dff630e9725828689d001ec9bc5baba0b7 odd thing i noted: if i run compiz with vblank_mode=0 and run glxgears it reports a frame-rate of about 1500 fps ( being the same as i get when running the previous revision kernel) but its still looks as slow as molasses if i unset vblank_mode then run it it reports about 5 fps but looks the same as before
I think this one is well knows, have you tried disabling writeback with no_wb=1 as radeon module parameter? Also note that gears is _not_ a benchmark.
yep passing radeon.no_wb=1 to the kernel fixes it @glxgears i kinda expected that but i don't think im using it for one... im just trying to show the difference between reported and apparent frame-rate in certain situations - it just seems odd...
More info + patch in https://bugs.freedesktop.org/show_bug.cgi?id=29972 *** This bug has been marked as a duplicate of bug 29972 ***
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