[Nouveau] [Bug 104835] MMIO read of 00000000 FAULT at 10ac08 [ IBUS ]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104835

--- Comment #2 from Tom D <codsmack at gmail.com> ---
Hardware: Lenovo P50
Symptoms:
This problem did not happen until I dist-upgraded from Fedora 26 to 27.

If the laptop is connected to the dock during boot, I get the logs below and
nothing further. I cannot shift desktops, log in, etc. Due to the
configuration, I cannot remotely SSH in without changing the FW after logging
in so I'm unsure about that behavior.

If I boot the system off of the doc and then place it into the doc before
logging in as a user, all seems to work well. I can then remove and re-seat the
laptop without issue.

If I boot the system, log in and then place it on the doc, sometimes (I do not
understand the pattern), the second screen attached to the dock is not seen at
all (does not show under displays). 

Same symptoms on numerous docs. 

I am concerned that the nouveau errors seen are unrelated to the actual
problems encountered.

Log snip
[    2.425868] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 022554
[ IBUS ]
[    2.427462] nouveau 0000:01:00.0: bus: MMIO read of 00000000 FAULT at 10ac08
[ IBUS ]

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