Gnome have already fixed this bug: https://mail.gnome.org/archives/commits-list/2014-May/msg01007.html https://bugzilla.gnome.org/show_bug.cgi?id=728449 Patch works. -- X was an interactive protocol: alpha blending a full-screen image looked like slugs racing down the monitor. http://www.keithp.com/~keithp/talks/usenix2000/render.html