[Bug 101355] New: [DP] [HSW] Resume from suspend to disk fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101355

            Bug ID: 101355
           Summary: [DP] [HSW] Resume from suspend to disk fails
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: victor.jesusx.lopez.carrillo at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 131811
  --> https://bugs.freedesktop.org/attachment.cgi?id=131811&action=edit
dmesg log

System Environment
=======
OS: Linux Ubuntu 17.04 64 bits
Kernel: 4.12.0-rc3-drm-tip-ww2-commit-187376e+
X-Org: 1.19.99.1

Regression?
=======
No

Bug detailed description
=======
Haswell fails to return from S4 state with configurations 
SST2 HDMI + DP + HDMI - 4k and 
SST2 HDMI + DP + HDMI + 4k
What happens is that the display connected via DP + HDMI resumes with no video.

Reproduce Steps
==============
Connect both HDMI and DP + HDMI displays
$sudo su
#echo disk > /sys/power/state
Wait 10 seconds
Turn the DUT back on

Expected Result
=============
Both displays should resume with video signal

Actual Result
===========
One of the displays fail to resume with proper video signal

Analysis & Root Cause
===================
Unknown

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