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[Launchpad Bug Tracker <791752@xxxxxxxxxxxxxxxxxx>]

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Image: Ubuntu 11.04 i386/amd64
Kernel version: 2.6.38-8-generic
CPU: i5-2410M
GPU: UMA

Summary: Can not set dual display to "External only" mode on Intel Sandy bridge systems
Steps to reproduce:
1) Use hotkey/Monitor preferences to toggle display
2) Set to "External only mode"

Expected result:
Should have External display set as primary display

Actual result:
Cannot set External display set as primary

two scenarios:
1) In unity 3D, setting external only will cause compiz crash
2) In unity 2D, setting external only will cause screen blinking

Additional info:
use "xrandr" to switch display does not have this problem

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: High
     Assignee: Keng-Yü Lin (lexical)
         Status: Confirmed


** Tags: hwe-blocker
-- 
Can not toggle Display to External only mode 
https://bugs.launchpad.net/bugs/791752
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