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

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

[bugzilla-daemon]

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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@lists.freedesktop.org
          Reporter: jian-hong@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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[Bug 107635] Internal display always be blank in mirror, extended and built-in only display mode

[bugzilla-daemon]

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

--- Comment #1 from Harry Wentland <harry.wentland@amd.com> ---
Have you tried with nouveau disabled?

https://askubuntu.com/questions/841876/how-to-disable-nouveau-kernel-driver/951892#951892

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

[bugzilla-daemon]

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

Daniel Drake <dan@reactivated.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |WORKSFORME

--- Comment #2 from Daniel Drake <dan@reactivated.net> ---
This issue was detected on 4.18.3 when using a somewhat reduced developer
config. When using our usual full distro kernel config (from Ubuntu), the issue
convincingly goes away.

Both Jian-Hong and I looked at the differences in the config and couldn't spot
anything obvious that would explain different behaviour.

There's probably a bug here somewhere, but as it's working on our shipped
config I'll close this issue, as we need to focus our time on other issues on
this platform.

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