Somehow, this could be related to bug #32461. Can youn please attach your last /var/log/Xorg.0.log?
Thanks!
** Changed in: xserver-xorg-video-ati (Ubuntu)
Assignee: (unassigned) => Alex Muntada
Status: Unconfirmed => Needs Info
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External monitor not working Radeon Mobility M6 LY
https://launchpad.net/bugs/67183
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