Comment 11 for bug 1378789

Steve also asked for some testing with Ubuntu Unity:

 - installing an Ubuntu precise desktop with unity7 (which I believe was the
   last release using cfq by default) and the .0 kernel (3.2.0)
 - using the system for a bit to try to reproduce the original problem -
   application windows becoming grayed out by the WM under normal usage,
   indicating that the app is not responding
 - changing the scheduler to deadline and testing to see if the problem
   persists or resolves itself
 - upgrading to the trusty backport kernel (linux-image-generic-lts-trusty)
 - verifying that the desktop behaves correctly with the default deadline
   scheduler
 - changing the scheduler to cfq and testing whether the original problem
   recurs

although I feel this should be done by the Ubuntu Unity team, there's no reason why Kubuntu should have to spend resources on the fallout from their bugs