https://bugs.freedesktop.org/show_bug.cgi?id=99353
--- Comment #28 from Bong Cosca bong.cosca@gmail.com --- I find this message particularly interesting because it occurs several times in the dmesg log:
[drm:radeon_crtc_handle_flip [radeon]] radeon_crtc->flip_status = 0 != RADEON_FLIP_SUBMITTED(2)