ive bisected to this commit:
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
*** This bug has been marked as a duplicate of bug 29972 ***