[Bug 39027] [evergreen] Monitor fails to come back after unplug and replug (recent regression)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=39027

Thomas Lindroth <thomas.lindroth at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Product|xorg                        |DRI
          Component|Driver/Radeon               |DRM/Radeon
         AssignedTo|xorg-driver-ati at lists.x.org |dri-devel at lists.freedesktop
                   |                            |.org
          QAContact|xorg-team at lists.x.org       |

--- Comment #1 from Thomas Lindroth <thomas.lindroth at gmail.com> 2011-07-07 02:50:21 PDT ---
It is a kernel regression. A bisect on the drivers/gpu folder resulted in the
following likely candidate.

commit 1e85e1d07b9255bd52c557f1a77fb72ccfacaf1c
Author: Alex Deucher <alexdeucher at gmail.com>
Date:   Fri May 20 04:34:29 2011 -0400

    drm/radeon/kms: simplify hotplug handler logic

    In the hotplug handler, just use the drm dpms functions.
    If the monitor is plugged in, turn it on, if it's not,
    turn it off.  This also reduces power usage by turning
    off the encoder and crtc when the monitor is unplugged.

    Signed-off-by: Alex Deucher <alexdeucher at gmail.com>
    Signed-off-by: Dave Airlie <airlied at redhat.com>

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