https://bugs.freedesktop.org/show_bug.cgi?id=38030

--- Comment #40 from Alex Deucher <[email protected]> 2011-11-29 10:47:54 PST ---
I suspect what is happening is that the monitor's auto input switch polls all
the connectors when when it polls the connector, it generates a hotplug event. 
The kernel driver then sends an event to userspace and the xserver listens for
the events and reacts by turning on the outputs.  Try commenting out:
drm_helper_hpd_irq_event(dev);
in radeon_irq_kms.c and see if that fixes the problem.  If it does, it's most
likely a userspace problem.

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