[Bug 107393] 4.18.0-rc6 amdgpu framebuffer problems with DisplayPort

[Bug 107393] 4.18.0-rc6 amdgpu framebuffer problems with DisplayPort

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https://bugs.freedesktop.org/show_bug.cgi?id=107393

            Bug ID: 107393
           Summary: 4.18.0-rc6 amdgpu framebuffer problems with
                    DisplayPort
           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: lkd-fdo@sky-haven.net

Created attachment 140848
  --> https://bugs.freedesktop.org/attachment.cgi?id=140848&action=edit
combined kernel dmesg for two boot sessions, one in 4.17.0 and the other in
4.18.0-rc6

On kernel 4.17.0, amdgpudrmfb functions correctly; taking the fb from efifb

On kernel 4.18.0-rc6 (and previous), the framebuffer proper doesn't start;
monitor doesn't get a valid display signal. If I log in and blind-start a
Wayland compositor (sway in my case), the display gets a desktop and things
work normally. Once I exit out back to FB, the display is blanked.

Everything works normally if I connect the monitor with HDMI instead.

This was a problem with 4.18.0-rc5 as well. I was pointed to the patch at
https://lists.freedesktop.org/archives/amd-gfx/2018-July/023920.html and
applied it to 4.18.0-rc5, but it had no effect on behavior.

GPU: Vega64
Monitor: Acer XR341CK

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[Bug 107393] 4.18.0-rc6 amdgpu framebuffer problems with DisplayPort

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https://bugs.freedesktop.org/show_bug.cgi?id=107393

--- Comment #1 from lkd-fdo@sky-haven.net ---
Additional new wrinkle (old bug but just for completeness)

The monitor I use (Acer XR341CK) evidently has a built-in DisplayPort MST, and
it's controllable for either extending the display or cloning it to the other
DP connector.

All the issues from this bug report disappear provided the MST mode is set to
clone the incoming signal.

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[Bug 107393] 4.18.0-rc6 amdgpu framebuffer problems with DisplayPort

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https://bugs.freedesktop.org/show_bug.cgi?id=107393

Martin Peres <martin.peres@free.fr> changed:

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

--- Comment #2 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/468.

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