[Bug 106592] New: 2nd GPU / screen not detected after driver / xorg update

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=106592

            Bug ID: 106592
           Summary: 2nd GPU / screen not detected after driver / xorg
                    update
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: blocker
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: atila.neves-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org

This is on Arch Linux. After an update, my 2nd monitor was no longer detected.
I downgraded nouveau to the Arch package version 1.0.15-2 (from 1.0.15-3) and
the problem went away. I also had to downgrade xorg-server due to dependency
issues, so it's possible the problem could be there and not in nouveau itself.
My xorg-server package is now xorg-server-1.19.6+13+gd0d1a694f-2, down from
xorg-server-1.20.0-2.

Both monitors work fine in the downgraded configuration, but only one works
with the latest updates.

When things weren't working, /var/log/Xorg.0.log showed the message "failed to
find screen to remove" for one of the GPUs. This is no longer the case after
the downgrade.

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