https://bugs.freedesktop.org/show_bug.cgi?id=38917
--- Comment #4 from Tomas Pospisek tpo_deb@sourcepole.ch --- As of linux 3.11 there is additional power management infrastructure for radeons:
http://www.botchco.com/agd5f/?p=57
Does that change anything wrt the here required functionality respectively this bug report?