[Bug 88382] New: [BSW] HDMI screen becomes black after resuming from S3/S4

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88382

            Bug ID: 88382
           Summary: [BSW] HDMI screen becomes black after resuming from
                    S3/S4
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jeff.zheng at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 112189
  --> https://bugs.freedesktop.org/attachment.cgi?id=112189&action=edit
dmesg after resume from S3

==System Environment==
--------------------------
Regression: No. I don't find a working version.

Non-working platforms: BSW
Working platforms: 

==kernel==
--------------------------
-nightly: /823e7150631cb1059edc9c57fc4c6f8454e1700e(fails)


==Bug detailed description==
-----------------------------
Boot BSW with HDMI connected, both eDP and HDMI screen show text. But after
suspend and resume, only eDP shows text, HDMI screen is blank

"testdisplay -a" shows normal, and if I control-C to abort, HDMI screen shows
text again.

==Reproduce steps==
---------------------------- 
1. Connect HDMI display to BSW and boot BSW
2. echo mem > /sys/power/state
3. Resume and check HDMI monitor

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