Comment 134 for bug 296167

The RANDR missing error may be the problem, you get this because it's not supported in xinerama, I was just ignoring it (doh!) but I definately see the issue moving from the GPU0-GPU1 boundary which just happens to be onto or off of my rotated screen. i think everyone with the triple monitor/xinerama combo will see that when opening X apps. I see it every time i gedit a file for example.

So maybe this will end up being an 'unsupported configuration' but at least we can now unlock with ease.