[Bug 46711] Monitor not turning on after DisplayPort re-plug in Xorg

[bugzilla-daemon@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=46711

--- Comment #6 from Tvrtko Ursulin <tvrtko.ursulin@onelan.co.uk> 2012-04-16 08:00:52 PDT ---
(In reply to comment #5)
> (In reply to comment #4)
> > forcing DPMS off and on will restore display.  (I have this shell script bound
> > to F12 and taping that key will restore the display.)
> > 
> >     xset dpms force off
> >     sleep 1
> >     xset dpms force on

This works for me as well.

> Are you getting proper hotplug connect/disconnect interrupts?  The driver does
> exactly the same thing on hotplug interrupts.  Assuming the display is active,
> on disconnect it calls dpms off, on connect it calls dpms on.  It also sends an
> event to userspace so it's possible that may be causing a conflict.  Take a
> look at radeon_connector_hotplug() in radeon_connectors.c in the kernel.

I see it calling drm_helper_connector_dpms(connector, DRM_MODE_DPMS_ON) from
radeon_connector_hotplug when I plug in the cable, meaning HPD sense said there
is something connected.

How to investigate this potential conflict with userspace?

Because, as I originally wrote, without X running monitor comes back fine.

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