Comment 57 for bug 197153

Btw, for those not yet subscribed to bug 198951:

I believe this issue is due to bugs in xrandr rather than an issue in gnome-settings-daemon itself. I've backported several bug fixes from upstream that look relevant to making xrandr work properly - these are from one of the radeonhd developers, so will be especially relevant for radeonhd users (and I suspect also relevant for other users).

Please install the three X server debs from this url which have been patched with the fixes, re-test, and let me know if it improves things:

  http://people.ubuntu.com/~bryce/Testing/XrandrGui/