(In reply to comment #10) > Please try eliminating some variables, e.g.: Does it also happen with > radeon.dpm=0? Does it also happen if you disable / enable compositing? ... I will try radeon.dpm=0 when I get a chance. Can I use dynpm then, or better not to avoid skewing the results? But what do you mean by "disable / enable compositing"? I am using openbox + compton.