[Bug 91905] New: [SKL] System hang on reboot/shutdown if HDMI is not plugged in before booting up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91905

            Bug ID: 91905
           Summary: [SKL] System hang on reboot/shutdown if HDMI is not
                    plugged in before booting up
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: tjaalton at ubuntu.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

If a HDMI display is plugged in to a SKL machine with an eDP panel, the system
hangs on reboot/shutdown if the display is plugged in after the OS has loaded. 
This only happens with HDMI, DP & DVI are fine. There's nothing alarming in the
logs, besides skl_update_other_pipe_wm warnings which has it's own bug.

Reproduced with UMSLAKSUB benchtop SDP running current nightly.

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