Comment 28 for bug 1292830

Same issue here:

Ubuntu 14.04 on Schenker 504M x64
Nvidia GeForce GTX850M driver 331.38

Bug started happening when I switched to using the Nvidia card, no issue before when using Intel integrated graphics.

Packages:

$ apt-cache policy nvidia-331-updates

nvidia-331-updates:
  Installed: (none)
  Candidate: 331.38-0ubuntu7
  Version table:
     331.38-0ubuntu7 0
        500 http://be.archive.ubuntu.com/ubuntu/ trusty/restricted amd64 Packages

$ apt-cache policy compiz

compiz:
  Installed: 1:0.9.11+14.04.20140423-0ubuntu1
  Candidate: 1:0.9.11+14.04.20140423-0ubuntu1
  Version table:
 *** 1:0.9.11+14.04.20140423-0ubuntu1 0
        500 http://be.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     1:0.9.11+14.04.20140409-0ubuntu1 0
        500 http://be.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

$apt list compiz nvidia-prime nvidia-331

Listing... Done
compiz/trusty-updates,now 1:0.9.11+14.04.20140423-0ubuntu1 all [installed]
nvidia-331/trusty,now 331.38-0ubuntu7 amd64 [installed]
nvidia-prime/trusty,now 0.6.2 amd64 [installed]