From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@freedesktop.org
Subject: [Bug 46711] Monitor not turning on after DisplayPort re-plug in Xorg
Date: Mon, 16 Apr 2012 15:00:52 +0000
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https://bugs.freedesktop.org/show_bug.cgi?id=46711
--- Comment #6 from Tvrtko Ursulin 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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