Hi I am testing squeeze, with xorg-radeon it works nicely (with kms and openGL) but the fan seems to be always at full speed (very noisy). i guess this has to do with powerplay which seems to be implemented : http://xorg.freedesktop.org/wiki/RadeonFeature but i did not find howto enable it for radeon mobility HD3400 (r6xx) either with testing or if needed unstable/experimental Any hint / url ... is welcome Thanks Alain