From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 71461] New: monitor doesn't get detected after boot
Date: Mon, 03 Mar 2014 08:06:27 +0000
Message-ID: <bug-71461-2300@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=71461

            Bug ID: 71461
           Summary: monitor doesn't get detected after boot
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.13.5
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: tom.ty89@gmail.com
        Regression: No

My card is Radeon HD5850.

The result might varies between different boot. Either the screens would not be
detected at all or they seem to be detected with a non-optimal resolution (in
console, while gdm shows a broken screen)

If a monitor is connected before boot, others can get detected correctly
afterwards.

If only one monitor is connected, turning it off can make the signal lost.
Reboot or suspend/resume (after turning it on again) can bring the signal back.
(Yet dpms would cause no problem at all)

The only way to reproduce the problem if DVI is involved is to disconnect it
physically, otherwise only powering off the monitor is required. My guess is
DVI detects display with a different mechanism.

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