I'm not able to reproduce this locally, could you try the following branch and 
see if it fixes it (for trusty)?
$ sudo apt-get build-dep lightdm
$ bzr branch lp:~robert-ancell/lightdm/lp1405349
$ cd lp1405349
$ bzr-buildpackage
And install the appropriate .deb files from ../build-area

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https://bugs.launchpad.net/bugs/1405349

Title:
  switching to activated guest session causes screen blank

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