Public bug reported:

Title: System freeze & no display if set External monitor as primary
(Performance mode)

Summary: System freeze & no display if set External monitor as primary
(Performance mode)

Steps:
1. Setup Graphic mode to Performance mode
2. Plug External monitor with HDMI
3. Set display mode to External monitor only is pass
4. Set display mode to Extend/ Mirror mode

Expected results: External monitor can be set as primary normally

Actual results: System freeze & no display if set External monitor as
primary (Performance mode)

** Affects: xorg-server (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: xorg-server-lts-vivid (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: xorg-server (Ubuntu Trusty)
     Importance: Undecided
         Status: Invalid

** Affects: xorg-server-lts-vivid (Ubuntu Trusty)
     Importance: Undecided
         Status: New

** Affects: xorg-server (Ubuntu Xenial)
     Importance: Undecided
         Status: New

** Affects: xorg-server-lts-vivid (Ubuntu Xenial)
     Importance: Undecided
         Status: Invalid

** Affects: xorg-server (Ubuntu Yakkety)
     Importance: Undecided
         Status: New

** Affects: xorg-server-lts-vivid (Ubuntu Yakkety)
     Importance: Undecided
         Status: Invalid

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1586260

Title:
  System freeze & no display if set External monitor as primary
  (Performance mode)

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https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1586260/+subscriptions

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