https://bugzilla.kernel.org/show_bug.cgi?id=60523
--- Comment #35 from pitamm@gmail.com --- I have the same problem with HD5700. Since the others have attached dmesg reports already, I am not including mine.
Unlike droste, when I do:
# echo high > power_dpm_force_performance_level OR # echo low > power_dpm_force_performance_level
nothing happens, and nothing prints to dmesg. I am always "stuck" in power level 2. Using 3.11git-rc5 from Fedora rawhide.