[Bug 90307] [IVB] at boot all displays cycled on/off over and over *ERROR* CPU pipe B FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90307

--- Comment #3 from Ander Conselvan de Oliveira <conselvan2 at gmail.com> ---
(In reply to Chris Bainbridge from comment #2)
> Maybe the log
> gives some hints, but a bug that only appears once in 22 days would take a
> long time to track down...

There are different reasons why a FIFO underrun can happen. Without the extra
information from a debug log, there is no clue as to what is the cause, or even
what hardware generation you have.

If you are willing to debug this further, add 'drm.debug=0xe log_buf_len=1M' to
your kernel command line (note that is different than my previous request), and
once you hit the problem again attach the dmesg to this bug report.

Also, please provide the output of "lspci -n -s 00:02.0".

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