[Bug 107623] (4.18.3)[drm:hwss_edp_wait_for_hpd_ready [amdgpu]] *ERROR* hwss_edp_wait_for_hpd_ready: wait timed out!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107623

            Bug ID: 107623
           Summary: (4.18.3)[drm:hwss_edp_wait_for_hpd_ready [amdgpu]]
                    *ERROR* hwss_edp_wait_for_hpd_ready: wait timed out!
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: jian-hong at endlessm.com

Created attachment 141196
  --> https://bugs.freedesktop.org/attachment.cgi?id=141196&action=edit
"wait timed out!" in dmesg

We have an ASUS X570ZD laptop equipped with AMD Ryzen 7 2700U with Radeon Vega
Mobile Gfx and NVIDIA GeForce GTX 1050 Mobile.

We tried with Linux kernel 4.18.3.

After system resumes from suspend, there is a prompted picture for a short
time, then system goes no display for a long time.
After the long time, system turns off the display's backlight. User must
presses any key to have the login screen.

The resume process is not smooth and hits the error:
[drm:hwss_edp_wait_for_hpd_ready [amdgpu]] *ERROR* hwss_edp_wait_for_hpd_ready:
wait timed out!

We have the dmesg with amdgpu.dc_log=1 and drm.debug=6

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