What I did was enable "ForceLowPowerMode", which is supposed to clock down to 1/2 (300/200MHz) core and memory. I edited radeon_pm.c so "ForceLowPowerMode" would downclock to 1/6 (100MHz) of the original frequency (600MHz), and that saved me like 4 extra Watts on my mobility HD3650.
I also enabled "ClockGating", in case that saves a little extra power.
I also enabled "ClockGating", in case that saves a little extra power.
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