Similar issue, same kernel version, same workaround. Message is:
[ 1.883338] nouveau 0000:02:00.0: bus: NMIO write of 00000002 FAULT at 4188ac
[ IBUS ]
1vmetad is not active yet, using direct activation during sysinit
and then hangs until I reboot into the older 4.2 kernel.
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https://bugs.launchpad.net/bugs/1574333
Title:
LVM-based server does not boot with kernel 4.4 (but works with 4.2)
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