[Nouveau] [Bug 103351] New: Nouveau fails when booting with a screen connected to displayport since 13a86519202c5d119d83640d6f781f3181205d2c

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103351

            Bug ID: 103351
           Summary: Nouveau fails when booting with a screen connected to
                    displayport since
                    13a86519202c5d119d83640d6f781f3181205d2c
           Product: Mesa
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: chris.glass at canonical.com
        QA Contact: nouveau at lists.freedesktop.org

As discovered when testing the latest release of Ubuntu with (mainline) trees,
commit 13a86519202c5d119d83640d6f781f3181205d2c seems to introduce a regression
when booting with a screen attached to displayport (the system otherwise boots
fine with the same kernel using an HDMI output).

An original bug was filed with the Ubuntu bug tracker and contains information
about bissection: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1723619

A (set of) dmesg outputs can be found here:
https://pastebin.ubuntu.com/25767385/ 

4.14-rc5 still exhibits this behavior on the tested system.

Please don't hesitate to reach out to me should you need more information - one
affected system happens to be my main workstation.

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