(In reply to comment #108)
> Btw, watching a video on Twitch spams my Xorg.0.log with *tons* of:
> > [ 21013.158] (WW) RADEON(0): radeon_dri2_flip_event_handler: Pageflip completion event has impossible msc 2822274 < target_msc 2822275

These are fixed in drm-fixes-3.16, but that hasn't been merged into
drm-next-3.17-wip yet.