[Bug 206387] New: amdgpu with amdgpu.dc=1 and multiple monitors on DisplayPort keeps changing devices

[Bug 206387] New: amdgpu with amdgpu.dc=1 and multiple monitors on DisplayPort keeps changing devices

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=206387

            Bug ID: 206387
           Summary: amdgpu with amdgpu.dc=1 and multiple monitors on
                    DisplayPort keeps changing devices
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.5.0
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: alexpereira@disroot.org
        Regression: No

Hi,

I have an amd rx580 with 2 monitors connected by display port.
The 2 monitors are the same brand and model.

When using the amdgpu driver with amdgpu.dc=0, the device names ( DisplayPort-2
and DisplayPort-3 ) stay consistent, but when using amdgpu.dc=1, the device
names change randomly ( or at least not consistent ).
They sometimes are DisplayPort-4 and DisplayPort-5 , sometimes DisplayPort-4
and DisplayPort-6, making me have to configure Xorg at every boot ( to correct
the placement of the monitors, which is left and which is right ) and configure
kde plasma and sway ( because they base their configurations on the device
names ).

Currently I switched to using amdgpu.dc=1 because amdgpu.dc=0 locks computer
after a wake up from suspend ( with amdgpu.dc=1 it does not ).

Thanks !

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[Bug 206387] amdgpu with amdgpu.dc=1 and multiple monitors on DisplayPort keeps changing devices

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=206387

Alex Deucher (alexdeucher@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com

--- Comment #1 from Alex Deucher (alexdeucher@gmail.com) ---
Please attach your xorg log (if using X) and dmesg output.  dc support DP MST
while the old dp=0 code does not.  With DP MST ports are added dynamically
since you can have multiple DP monitors connected to a single physical port on
the computer.

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[Bug 206387] amdgpu with amdgpu.dc=1 and multiple monitors on DisplayPort keeps changing devices

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=206387

--- Comment #2 from Alexandre Pereira (alexpereira@disroot.org) ---
Created attachment 287099
  --> https://bugzilla.kernel.org/attachment.cgi?id=287099&action=edit
xorg and dmesg log - boot 1

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[Bug 206387] amdgpu with amdgpu.dc=1 and multiple monitors on DisplayPort keeps changing devices

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=206387

--- Comment #3 from Alexandre Pereira (alexpereira@disroot.org) ---
Created attachment 287101
  --> https://bugzilla.kernel.org/attachment.cgi?id=287101&action=edit
xorg and dmesg log - boot 2

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[Bug 206387] amdgpu with amdgpu.dc=1 and multiple monitors on DisplayPort keeps changing devices

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=206387

--- Comment #4 from Alexandre Pereira (alexpereira@disroot.org) ---
Hi,

submitted two attachments, they have the xorg and dmesg log of bootup until
login manager ( in this case sddm ) appears.

bootup 1 is the first reboot, and bootup 2 is a reboot right after getting the
previous logs, nothing else was done in between.

Thanks.

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