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 Desktop
Packages, 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
Status in “xserver-xorg-video-nouveau” package in Ubuntu:
Confirmed
Bug description:
Xorg crashed and all I had this line on TTY1 :
[ 5589.174937] [drm] nouveau 0000:01:00.0: GPU lockup - switching to
software fbcon
You can find this error on line 216 in my syslog
ubuntu@precise:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu precise (development branch)
Release: 12.04
Codename: precise
ubuntu@precise:~$ uname -a
Linux precise 3.2.0-18-generic-pae #28-Ubuntu SMP Fri Mar 2 22:11:12 UTC 2012
i686 i686 i386 GNU/Linux
ubuntu@precise:~$ sudo lshw -c display
[sudo] password for ubuntu:
*-display
description: VGA compatible controller
product: GF104 [GeForce GTX 460]
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:f8000000-f9ffffff memory:e8000000-efffffff
memory:f0000000-f3ffffff ioport:e000(size=128) memory:fa000000-fa07ffff
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