[Bug 66563] New: [SNA IVB] External monitor (VGA1) unusable if plugged in after xorg start

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66563

          Priority: medium
            Bug ID: 66563
          Assignee: chris at chris-wilson.co.uk
           Summary: [SNA IVB] External monitor (VGA1) unusable if plugged
                    in after xorg start
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: timo at kamph.org
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

After upgrading from xf86-video-intel-2.21.10 to 2.21.11, the external monitor
I attach to my laptop (VGA1) shows only some red pixels on black background if
I attach the monitor after xorg started. If the monitor is attached during
boot, it works fine. On LVDS1 and on screenshots, the image is correct.
Therefore, the issue seems to be the output and not the rendering.

Actually, you can recognize window borders and some (originally black) text in
the red pixels. The black background in the terminal emulator is displayed
completely red.

The issue is still present in git (commit
1445a62da8a08acd8a732176d085fd098f68cec3). Bisecting the commits between
2.21.10 and 2.21.11 locates the problem between commit
362b0dc6a3b1692b752d8f250075ccc81debfca3 (good) and commit
362b0dc6a3b1692b752d8f250075ccc81debfca3 (bad). Trying any of the commits in
between results in a black screen on LVDS1 and an unusable X.

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