[Bug 108764] New: The native screen(eDP) would be black when rotate the external screen to inverted from normal

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108764

            Bug ID: 108764
           Summary: The native screen(eDP) would be black when rotate the
                    external screen to inverted from normal
           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: quanxian.wang at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

This bug happens on all OSVs and latest upstream code.

System Environment
=======
Platform Info: WHL-U(all platforms with eDP support)
Label: WHLU01
Processor: Genuine Intel(R) CPU 0000 @ 1.60GHz
Bios: CNLSFWR1.R00.X137.B00.1803280218
OS: ubuntu 18.10
Kernel: 4.18.0-9-generic


Bug detailed description
=======
Platform information:
Platform: WHLU
Label: WHLU01
Prcessor: Genuine Intel(R) CPU 0000 @ 1.60GHz
Bios: CNLSFWR1.R00.X137.B00.1803280218
OS: Ubuntu18.10(Cosmic Cuttlefish)
Kernel: 4.18.0-10-generic
Details:
1) Connect the SUT to an external screen with DP cable;
2) Power on and boot into the OS;
3) Rotate the DP screen with the command "xrandr --output xxx ("DP screen's
name") --rotate left/right/inverted/normal";

Results:
1) The native and DP screen displayed well when rotate the HDMI/DP screen to
left or right;
2) The native screen and HDMI/DP screen would display well if rotate the
HDMI/DP screen to inverted from left or right;
3) The native screen would be black when rotate the HDMI/DP screen to inverted
from normal, but the HDMI/DP screen displayed well.
No info in dmesg log, so just attach the journalctl log(
journalctl_4.18.0-10_rotate_WHLU.log ).


Expected Result
=============
work normally

Actual Result
===========
eDP turns black. But when rotate normal, it changed back and works well.

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

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