[Bug 97958] New: i915 drm module sometimes loops between HDMI connected and disconnected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97958

            Bug ID: 97958
           Summary: i915 drm module sometimes loops between HDMI connected
                    and disconnected
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: leo at strike.wu.ac.at
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 126824
  --> https://bugs.freedesktop.org/attachment.cgi?id=126824&action=edit
dmesg output of loop (drm.debug=255)

Sometimes, after it had worked fine for hours, my Intel Skylake graphics starts
to loop between HDMI connect and disconnect events. (Of course the TV actually
stays connected, although switched off.)

The corresponding drm.debug=255 messages are attached as dmesg-drm-debug.log.
This results in udev events, which cause the X-Server to log the output shown
in Xorg.0.log

Interestingly, the loop can be interrupted by calling
  env DISPLAY=:0 xrandr --output HDMI1

After that command, the events stop again and the HDMI output correctly shows
as connected.

I am using kernel 4.7.3-200.fc24.x86_64 (Fedora 24).

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