https://bugs.freedesktop.org/show_bug.cgi?id=49981

--- Comment #5 from graham grhm.perry@gmail.com --- If anyone with an hd6k can add drm.debug=2 to the kernel options and then post the result of dmesg | grep "radeon_pm_print_states" it would help. For me it is showing 4 power states, only 1 of which is 'performance', which the rest being default. I think there is something wrong in atombios, as there should only be one default.