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[vanzylst <svz@xxxxxxxxx>]

I experience the same problem (mouse and keyboard stuttering every 5-10s
for a short while) with a 2.6.35-020635rc3-generic kernel on Lucid. In
my case, it looks like it may be related to my Radeon video card's
dynamic power saving modes.

The following works for me:
echo profile > /sys/class/drm/card0/device/power_method (results in driver not using dynpm and sticking to fixed gpu/memory clocks)
cat /sys/kernel/debug/dri/0/radeon_pm_info
default engine clock: 875000 kHz
current engine clock: 874960 kHz
default memory clock: 1250000 kHz
current memory clock: 1250000 kHz

If I then re-enable dynpm I don't experience the problem anymore, except
when the driver decides to go down to a lower clock speed (which I'm not
sure how to control).

-- 
[gm45] Xorg stuttering on clean maverick amd64 bit install
https://bugs.launchpad.net/bugs/599068
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