same problem here. System freezes completely(except, I can move mouse pointer. 
Just move, no click) and after restart buch of "nouveau 0000:01:00.0: fifo: 
SCHED_ERROR 0a [CTXSW_TIMEOUT]" in syslog. ubuntu 16.04, 4.4.0-78-generic 
#99-Ubuntu SMP, Lenovo P50.
I cannot switch to nvidia-XXX driver as it is unusable in multiple monitors 
configuration.

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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-nouveau in Ubuntu.
https://bugs.launchpad.net/bugs/1661486

Title:
  nouveau write fault, CTXSW_TIMEOUT, hangs the display

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https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1661486/+subscriptions

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