https://bugs.freedesktop.org/show_bug.cgi?id=110865
--- Comment #25 from Alex Deucher alexdeucher@gmail.com --- The patches I posted only affect multiple monitors with identical timing. That means identical modelines, not just the same resolution and refresh rate. In practice this generally means you need to use identical monitors. If you are using a single monitor or multiple different monitors, the patches are not relevant for you.