Comment 10 for bug 1501260

also interesting when i use glxgears with multiple it might only freeze on the main monitor,
specially if i move the window slowly from the second monitor to the first it might freeze while the window is visible on both monitors, but if i drag it fast to the main monitor it might freeze not.

but it 100% freeze if i want to move it outside of the main monitor.

my monitor configuration is that the second is left from the main monitor but 90% rotated.
and if i move it right out of the first monitor then it freeze.