https://bugs.freedesktop.org/show_bug.cgi?id=99418
--- Comment #30 from Michel Dänzer michel@daenzer.net --- (In reply to lei.pero from comment #29)
Just want to add few things, did reported bug to gnome project, but, problem does not happen when "vblank_mode" value in .drirc configuration file is set to 1 (instead of 0 I've used before).
1 means sync-to-vblank is disabled by default, but the application can enable it explicitly. 0 means sync-to-vblank is disabled regardless of what the application wants. So this could actually be considered a configuration issue instead of a bug anywhere.