[Bug 112407] New: [i915] eDP cannot light up after waking up from suspend the second time.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112407

            Bug ID: 112407
           Summary: [i915] eDP cannot light up after waking up from
                    suspend the second time.
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: not set
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: yvonnex.yang at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 146033
  --> https://bugs.freedesktop.org/attachment.cgi?id=146033&action=edit
dmesg log

Platform: CML Laptop with ALC711+ ALC1308+ ALC715 in SDW mode

Reproduce Steps:

1.Do system reboot with HDMI/DP external port connected.
2.Enter suspend via "sudo rtcwake -m mem -s 10", and unplug HDMI/DP external
port during suspend.
3.Enter suspend again after waking up from suspend in step2

Frequency:100%

Expected result:
After step3, eDP should light up after waking up from suspend.

Actual result:
After step3, eDP cannot light up after waking up from suspend.

Tested it with
linux-image-unsigned-5.4.0-050400-generic_5.4.0-050400.201911242031_amd64.deb,
issue can still be reproduced.

With HDA legacy driver, same symptom still exist.

Need to fix in graphics driver.

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