https://bugs.freedesktop.org/show_bug.cgi?id=91656
--- Comment #3 from Matias Hilden domewolf@gmail.com --- This issue also happens on radeonsi, with Mesa 11.1.0-devel (git-d6fbcf6).
According to POE forums, it used to happen on catalyst too at some point, but it has been fixed since.
My card is R9 280.