Display settings don't stick the second time around

Loki Beta release
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- Tested on Lenovo Ideapad Z560, running on bare metal, with external display configuration.
- In System Settings Display, if the orientation of Displays is changed once, the next attempt to change it has no effect.
- It is easily reproducible.

Launchpad Details: [#LP1596399](https://bugs.launchpad.net/bugs/1596399) asimsalam - 2016-06-27 02:47:46 +0000

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