This is fixed in Maverick.  The new 2.6.35 kernels have power
management, both dynamic and profile-based.  You can switch between
dynamic and profile-based management by writing “dynpm” or “profile” to
/sys/class/drm/card0/device/power_method, and switch profile (options
are “auto”, “low”, “high”, “default”) by writing to
/sys/class/drm/card0/device/power_profile

(Depending on your configuration, “card0” might be different)

-- 
[RV620] No power management with ati driver
https://bugs.launchpad.net/bugs/373669
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