Comment 13 for bug 1320989

Same problem, this is not Elementary OS specific. Xubuntu here.

Started happening after I added a 2nd monitor to the system. Both monitors are running from the primary video card, an AMD Radeon R9 280x (on fglrx 15.30.3).

Happens consistently if the primary monitor is powered off when attempting to wake screen from lock/sleep. Also happens at other times inconsistently (I haven't found the pattern).

Sometimes portions of windows and desktop icons are black, depending on the window. Chrome doesn't seem affected, terminal windows are. The panel is always affected (black). Going to panel properties redraws it. `xrefresh` does not.