[Nouveau] [Bug 102631] New: Multiple nouveau stacks on kernel log when connecting a external monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102631

            Bug ID: 102631
           Summary: Multiple nouveau stacks on kernel log when connecting
                    a external monitor
           Product: Mesa
           Version: 17.1
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: emilio at crisal.io
        QA Contact: nouveau at lists.freedesktop.org

Created attachment 134100
  --> https://bugs.freedesktop.org/attachment.cgi?id=134100&action=edit
relevant dmesg output

Sorry for the non-descriptive bug title in advance, I'm not sure which parts of
the logs are worth a bug report, but I'm moderately sure that something in here
deserves a bug filed.

My machine is a Lenovo P50 with:

    VGA compatible controller: NVIDIA Corporation GM107GLM [Quadro M2000M] (rev
a2)

And mesa version 17.1.8

I connected an external monitor to the HDMI port, and I got black screens for a
few retries.

On an unrelated (maybe not so unrelated?) note, I get reproducible FAULTs on
startup, regardless of any monitor attached or not I believe. I also got some
others on today's log, but that may be just related to the problem above. The
first two lines below repro even without an external monitor:

    [    2.690083] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at
022554 [ IBUS ]
    [    2.691514] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at
10ac08 [ IBUS ]
    [   23.396822] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at
690000 [ TIMEOUT ]
    [   41.791019] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at
690000 [ TIMEOUT ]
    [   41.791902] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at
6900c0 [ TIMEOUT ]
    [   51.876682] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at
690000 [ TIMEOUT ]
    [   61.915247] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at
690000 [ TIMEOUT ]
    [   75.297725] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at
690000 [ TIMEOUT ]

Happy to help providing more information, testing, or even trying to contribute
a fix (with some guidance ideally, since I know nothing about the driver's code
:P).

Thanks a lot in advance.

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