[Bug 51980] New: sometimes X segfault on xrandr --auto after an activated screen (HDMI) is disconnected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=51980

             Bug #: 51980
           Summary: sometimes X segfault on xrandr --auto after an
                    activated screen (HDMI) is disconnected
    Classification: Unclassified
           Product: xorg
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: haagch.christoph at googlemail.com
         QAContact: xorg-team at lists.x.org


Created attachment 64104
  --> https://bugs.freedesktop.org/attachment.cgi?id=64104
Xorg.0.log

I often use dualscreen via HDMI on my notebook with a HD 6550M / HD 5650M with
the external display being the primary display and then simply disconnect the
external display and use xrandr --auto to restore to LVDS only display.

Recently X has been segfaulting when doing the xrandr --auto, but only
occassionally.

I use xorg stable (1.12.3) and xf86-video-ati from git.
(It has been happening since at least 1.12.2 and some older xf86-video-ati-git
builds).

If you can see the problem from the short backtrace in the attached log file,
great. If not, please tell me so I can try to get a proper backtrace with a
debug build.

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