(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.