[Bug 100641] New: Broadwell-U HD Graphics 5500. DisplayPort status unknown after suspend/resume

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=100641

            Bug ID: 100641
           Summary: Broadwell-U HD Graphics 5500. DisplayPort status
                    unknown after suspend/resume
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.1.0
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: kuddel.mail at gmx.de
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

I am using a Thinkpad X1 Carbon 3rd with 
Intel Core i7-5500U CPU with integrated Intel HD Graphics 5500

after suspend and resume the display status of all display ports is unknown.

Output before suspend looks like
/sys/class/drm/card0-DP-1/status:disconnected
/sys/class/drm/card0-DP-2/status:disconnected
/sys/class/drm/card0-eDP-1/status:connected
/sys/class/drm/card0-HDMI-A-1/status:disconnected
/sys/class/drm/card0-HDMI-A-2/status:disconnected

Output after suspend looks like
/sys/class/drm/card0-DP-1/status:unknown
/sys/class/drm/card0-DP-2/status:unknown
/sys/class/drm/card0-eDP-1/status:unknown
/sys/class/drm/card0-HDMI-A-1/status:unknown
/sys/class/drm/card0-HDMI-A-2/status:unknown

As systemd reads this values to interpret correct lid closure behaviour
subsequent lid closures do not suspend my machine.

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