Happens to me as well:
lshw -c display
*-display
description: VGA compatible controller
product: GF108 [Quadro 1000M]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:01:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
configuration: driver=nouveau latency=0
resources: irq:16 memory:d0000000-d0ffffff memory:c0000000-c7ffffff
memory:c8000000-c9ffffff ioport:4000(size=128) memory:d1080000-d10fffff
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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/952113
Title:
[ 5589.174937] [drm] nouveau 0000:01:00.0: GPU lockup - switching to
software fbcon
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/952113/+subscriptions
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