[Bug 89631] New: [BSW] DP screen is black after resuming from S3/S4 when DP connection is the only connection

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89631

            Bug ID: 89631
           Summary: [BSW] DP screen is black after resuming from S3/S4
                    when DP connection is the only connection
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: major
          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 114421
  --> https://bugs.freedesktop.org/attachment.cgi?id=114421&action=edit
dmesg log

==System Environment==
--------------------------
HDMI monitor: ASUS PA238Q
BIOS: V59 
Regression: No. Tried on drm-intel-testing-2015-01-30 and still saw this issue.
This might be related with processor and BIOS upgrade, since I tested before
and didn't find this issue at that time.

Non-working platforms: BSW

==kernel==
--------------------------
-testing: drm-intel-testing-2015-03-13 (fails)

==Bug detailed description==
-----------------------------
When connected ASUS PA238Q monitor with DP cable and un-plug eDP cable to keep
DP to be the only connection, DP screen will be black screen after resuming
from S3/S4.



==Reproduce steps==
---------------------------- 
1. Connected ASUS PA238Q with DP cable, un-plug eDP cable and boot
2. echo mem > /sys/power/state
3. Resume by pressing power button

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