https://bugs.freedesktop.org/show_bug.cgi?id=75649
--- Comment #7 from tderensis@gmail.com --- I can confirm that only switching modes to 1920x1080 causes the issue. The latest I have tested is Arch 3.15.5, Cinnamon desktop, Mesa 10.2.4, and xf86-video-ati 1:7.4.0. Maybe this is an xrandr issue?