Created attachment 109679 [details]
Screenshot of HUD with drm-next-3.19 and Mesa from git

I've tested the latest git version of mesa combined with a drm-next-3.19
kernel, and indeed the issue seems to be fixed with this combination.
There are some very minor stutters still, but those are hardly noticable and
I'm not certain if they are related to the bug, or caused by something else
(disk activity,...).