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 15:25:12 +0000
Message-ID: <bug-46711-502-TxElihVhHc@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 #7 from Alex Deucher <agd5f@yahoo.com> 2012-04-16 08:25:12 PDT ---
(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.

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