This bug was fixed in the package xorg-server-lts-vivid -
2:1.17.1-0ubuntu3.1~trusty1.1
---------------
xorg-server-lts-vivid (2:1.17.1-0ubuntu3.1~trusty1.1) trusty; urgency=medium
* randr-adjust-masters-last-set-time.diff,
randr-do-not-check-the-screen-size.diff:
Fix issues changing display mode on prime setups. (LP: #1586260)
-- Timo Aaltonen <tjaal...@debian.org> Mon, 30 May 2016 16:41:23 +0300
** Changed in: xorg-server-lts-vivid (Ubuntu Trusty)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1586260
Title:
System freeze & no display if set External monitor as primary
(Performance mode)
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