[Bug 105811] kernel 4.15.x boot fails at kms

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105811

--- Comment #10 from Alec Habig <ahabig at umn.edu> ---
Good idea Jani!

Removed bumblebee and the proprietary nvidia driver.  This didn't fix things,
but it did allow me to go further before things locked up.  Including actual
system logging!

Attached a dmesg output I got before things fell over.  Upon booting, it seems
the nouveau driver kms fails, then it falls over to i915.  You can see nouveau
initializing around 2.2 seconds in the log, then timing out at around 16
seconds.  The first actual kernel crashes come later, starting with ieee80211
complaints.  I was able to dmesg to a logfile and scp it away before things
really unraveled.  Hitting ctl-alt-del (all on console) induces a hard hang.

blacklisting nouveau and rebuilding the initfs, it's back to the original
problem of not even booting happily.  Disabling the discrete card in bios does
not change this behavior.  The tail of its problems again shows up eventually
on my second monitor, looking similar to the initial attachments where
drm_atomic_helper is timing out.  Wait... as I type this it eventually got to
single user mode, second dmesg dump retrieved before it hang (again on
ctl-alt-del).  But, dumping that to a text file didn't make it to disk, the
crash didn't flush the disk write buffer :(

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