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 15:54:47 +0000
Message-ID: <bug-46711-502-q9WVpUChqB@http.bugs.freedesktop.org/>
References: <bug-46711-502@http.bugs.freedesktop.org/>
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https://bugs.freedesktop.org/show_bug.cgi?id=46711

--- Comment #8 from Tvrtko Ursulin <tvrtko.ursulin@onelan.co.uk> 2012-04-16 08:54:47 PDT ---
(In reply to comment #7)
> (In reply to comment #6)
> > How to investigate this potential conflict with userspace?
> > 
> > Because, as I originally wrote, without X running monitor comes back fine.
> 
> It's probably missing locking in the radeon kernel modesetting code.  The ddx
> registers an event handler in the xserver and then the desktop environment does
> something with the event.  See drmmode_uevent_init() and
> drmmode_handle_uevents() in drmmode_display.c in xf86-video-ati.

Brief look doesn't show me any locks there, I'll dig in.

If relevant, we have the same symptoms with and without a "desktop
environment". Meaning same thing happens with pure X, and also with our
software running which does explicit output probing when nothing is connected.

Problem is (seems to me) xrandr reports monitor connected when in that state.

Also if relevant we do get two RandR events (RRScreenChangeNotify and
RRNotify_OutputChange) when re-plugging the monitor.

Unless there is no intersection between RandR and DPMS... ?

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