I got it too, X freezes right after this :

May  1 16:05:56 lisak kernel: [ 1588.032792] nouveau E[Xorg[1323]] failed to 
idle channel 0xcccc0000 [Xorg[1323]]
May  1 16:05:57 lisak gnome-session[1879]: Gdk-WARNING: gnome-session: Fatal IO 
error 11 (Resource temporarily unavailable) on X server :0.#012
May  1 16:05:57 lisak colord: device removed: xrandr-BenQ-BenQ 
G2411HD-D4910151SL0
May  1 16:05:57 lisak colord: Profile removed: 
icc-d63583c0a76a513bac920519a90532e8
May  1 16:06:12 lisak kernel: [ 1603.182708] nouveau E[compiz[2063]] failed to 
idle channel 0xcccc0000 [compiz[2063]]

VGA compatible controller: NVIDIA Corporation C77 [GeForce 8200] (rev a2)

dpkg -l | grep nouveau
ii  libdrm-nouveau2:amd64                                 2.4.52-1              
                              amd64        Userspace interface to 
nouveau-specific kernel DRM services -- runtime
ii  xserver-xorg-video-nouveau                            1:1.0.10-1ubuntu2     
                              amd64        X.Org X server -- Nouveau display 
driver

uname -a
Linux lisak 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:11:08 UTC 2014 
x86_64 x86_64 x86_64 GNU/Linux


** Attachment added: "Xorg.0.log"
   
https://bugs.launchpad.net/ubuntu/+source/linux-lts-quantal/+bug/1097178/+attachment/4102369/+files/Xorg.0.log

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https://bugs.launchpad.net/bugs/1097178

Title:
  nouveau failed to idle channel 0xcccc0000

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