https://bugzilla.kernel.org/show_bug.cgi?id=68571
--- Comment #31 from kilobug@kilobug.org --- I tried the drm-fixes-3.14 branch, but it didn't work better for me - playing a video with mplayer freezes the system in less than one minute (with radeon.dpm=1). I didn't run any other test with it.
If needed, I can run more tests during the week-end, but I don't know what kind of tests could be useful.