[Bug 87223] New: [BSW] eDP screen is blank when booting with DP display connected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87223

            Bug ID: 87223
           Summary: [BSW] eDP screen is blank when booting with DP display
                    connected
           Product: DRI
           Version: DRI git
          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 110718
  --> https://bugs.freedesktop.org/attachment.cgi?id=110718&action=edit
dmesg information after step 3

==System Environment==
--------------------------
Regression: No. First test on this machine.

Non-working platforms: BSW
Working platforms: 

==kernel==
--------------------------
-nightly: a243fbbcfd348ec042b100f3ce02f215252d177d(fails)
-queued: 5cb7179b428cf00dd96e74ed4f37efb19ba05e14(test fails in the same way)
    Detail of the commit
-fixes: sha1 (test fails in the same way)
    Detail of the commit

==Bug detailed description==
-----------------------------
Boot BSW with DP connected, when login appears on DP display, the eDP screen
does not show anything. 

If I boot BSW without DP connected, I can see login on DP display. But if I
connect DP screen with BSW, only DP screen shows login and eDP screen is blank
again.

==Reproduce steps==
---------------------------- 
1. Connect DP display to BSW and boot BSW
2. When login appears on DP display, the eDP screen does not show anything
3. Running xinit shows xterm on DP display, but eDP screen still does not show
anything.

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