Comment 31 for bug 988290

I merged 1037895 into this

Changing from the intel xserver to gnome-screensaver; from the reports it doesn't seem to be Intel specific.
Whether it's actually gnome-screensaver or something else seems to be difficult to tell; most people seem to be saying removing it helps them, but #30 is not sure; but the conclusion seems to be other desktops don't suffer from it.

However, the fact that xrandr reprobe causes it to sort out seems to suggest it might not be the screensavers problem?