[Bug 99434] Intel 6700 HD 530 hdmi never wakes up after suspend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99434

            Bug ID: 99434
           Summary: Intel 6700 HD 530 hdmi never wakes up after suspend
           Product: Mesa
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: hnr2k6 at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Seems like a common problem independent of the actual OS across Intel graphics
devices:
http://askubuntu.com/questions/794440/no-hdmi-video-after-suspend-on-intel-nuc6i7kyk

https://techreport.com/forums/viewtopic.php?t=118272


I have tried many kernels from 4.4 to 4.9. All exhibit the same issue.
Currently on Ubuntu 16.10 with the latest intel graphics drivers. 

Display port works fine. I have swapped cables and tried different monitors.
Same issue. Rebooting gets nback the hdmi display. On resume, the port looks
dead.

I noticed a similar issue: https://bugs.freedesktop.org/show_bug.cgi?id=94014

Please let me know how I can help to debug the issue. Thanks

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