https://bugs.freedesktop.org/show_bug.cgi?id=93762
--- Comment #3 from andre35822@yahoo.com --- (In reply to Nicolai Hähnle from comment #2)
Thanks for the report. Did the messages
[43513.525167] [drm:si_dpm_set_power_state [radeon]] *ERROR* si_set_sw_state failed [43982.380508] [drm:si_dpm_set_power_state [radeon]] *ERROR* si_restrict_performance_levels_before_switch failed
occur at the same time as the stutter? That would point at a kernel problem.
No messages appeared on my screen, what I have noticed is that whenever this freezing occurs, so does my entire system essentially (I can still hear audio from Skype or Mumble but I can't interact with things)...however those messages seem familiar..ahh I know. I think I have seen those messages occasionally show up on my screen when I log out/log back in. I think I started getting this since the 4.1 kernels....
I am not really sure what I can do to further help you but please let me know!
Although, this portion is offtopic. I have another machine with an AMD 6570 or something and those messages would occasionally show up on Linux Mint 17.1 and the kernel that one uses is 3.18.