https://bugs.freedesktop.org/show_bug.cgi?id=71083

--- Comment #1 from Alex Deucher <agd5f at yahoo.com> ---
Are you unplugging the cable from the card when you switch the monitors?  That
should generate a hotplug event which will trigger the graphics stack to
reprobe the displays.  If you are just changing the monitor connected to the
receiver, it sounds like the receiver never sends a hotplug event to the card. 
As such the card has no way of knowing that the EDID has changed.

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