[Bug 94689] Two monitor DisplayPort MST DaisyChain (Second/Last Monitor In Chain Black Screen)

[Bug 94689] Two monitor DisplayPort MST DaisyChain (Second/Last Monitor In Chain Black Screen)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=94689

            Bug ID: 94689
           Summary: Two monitor DisplayPort MST DaisyChain (Second/Last
                    Monitor In Chain Black Screen)
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: mike.ennen@gmail.com

As per our chat in #radeon (I am brcolow).

Here is the dmesg with dri.debug=6:

https://gist.github.com/brcolow/e27a5e46b175dd0966af

Here is /sys/kernel/debug/dri/0/radeon_mst_info contents:

    mst: ffff88061cedfb40, 0
    port: 1: ddps: 1 ldps: 0, sdp: 1/1, ffff8800bb193000, conn:
ffff880622b27000
    port: 8: ddps: 1 ldps: 0, sdp: 1/1, ffff8800bb192800, conn:
ffff880622049000
    port: 0: ddps: 1 ldps: 0, sdp: 0/0, ffff8800bb192000, conn:          
(null)
vcpi: 7 3
vcpi 0: 8 1 22
vcpi 1: 1 2 22
vcpi 2:unsed
vcpi 3:unsed
vcpi 4:unsed
vcpi 5:unsed
payload 0: 2, 1, 22
payload 1: 2, 23, 22
payload 2: 0, 45, 0
payload 3: 0, 45, 0
payload 4: 0, 45, 0
payload 5: 0, 45, 0
dpcd: 12 14 c4 01 01 01 01 81 02 00 06 00 00 00 00 
faux/mst: 00 01 
mst ctrl: 07 
branch oui: 00e04c devid: Dp1.2 revision: hw: 0.0 sw: 0.0
payload table: 07 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
01 01 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 02 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
attrib 0: 4 22
attrib 1: 2 22

The two monitors that are being daisy-chained are Dell UltraSharp U2715H's. GPU
is Radeon R9 290.

I have tried doing:

xrandr --output DisplayPort-0-1 --rate X

where X = 59.9, 60, 49.9, 50, 39.9, 40 etc but it doesn't seem to change
anything (and this is the extent of my debugging abilities).

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[Bug 94689] Two monitor DisplayPort MST DaisyChain (Second/Last Monitor In Chain Black Screen)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=94689

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

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

--- Comment #1 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/704.

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