[Bug 107635] Internal display always be blank in mirror, extended and built-in only display mode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107635

            Bug ID: 107635
           Summary: Internal display always be blank in mirror, extended
                    and built-in only display mode
           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 141208
  --> https://bugs.freedesktop.org/attachment.cgi?id=141208&action=edit
log of display mode changement

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

We tested it with Linux kernel 4.18.3.  It is nouveau with parameters runpm=0
and noaccel=1 as the driver for NVIDIA GeForce GTX 1050 Mobile card.

After plugin the HDMI cable, the system is in extended mode and displays
correctly.

But the internal display becomes blank after changes to mirror mode, extended
mode and built-in only mode.  The external display always works correctly.

There are the errors: 
"[drm:hwss_edp_wait_for_hpd_ready [amdgpu]] *ERROR*
hwss_edp_wait_for_hpd_ready: wait timed out!"
"[drm:drm_dp_dpcd_access [drm_kms_helper]] Too many retries, giving up. First
error: -71"
in dmesg.

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