Bug#864349: nouveau: fifo: write fault at 0000e5f000 engine 1b [CE2] client 18 [GR_CE] reason 02 [PTE] on channel 8

[Peter Makholm <peter@makholm.net>]

By the way,

Magic SysRq seems to work. That is, 'Alt-SysRq k' kills the locked up X
session. It is not always that gdm3 recovers correctly and if X is
respawned it might perform slow and unstable.

Another option is to use Magic SysRq to reboot as gently as possible
without removing your hads from the keyboard (something along the lines
of 'e i s u b').

//Makholm