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[Launchpad Bug Tracker <1410238@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package xserver-xorg-video-intel -
2:2.99.910-0ubuntu1.4

---------------
xserver-xorg-video-intel (2:2.99.910-0ubuntu1.4) trusty-proposed; urgency=medium

  [ Timo Aaltonen ]
  * sna-fix-gen8-blt.diff
    sna-tweak-alignment-constraints-on-gen8.diff
    sna-add-more-checks-and-asserts-for-blt.diff:
    - Fix GEN8 BLT with 4bit address. (LP: #1401788)

  [ Maarten Lankhorst ]
  * Fix regression with external displays on sna. (LP: #1405325)
  * Fix rotating external display with optimus results in corruption.
    - fix-sna-external-slave-rotation.patch (LP: #1410238)
 -- Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxx>   Tue, 13 Jan 2015 17:14:19 +0100

** Changed in: xserver-xorg-video-intel (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1410238

Title:
  Rotating external display with optimus results in corruption

Status in xserver-xorg-video-intel package in Ubuntu:
  Fix Released
Status in xserver-xorg-video-intel source package in Trusty:
  Fix Released
Status in xserver-xorg-video-intel source package in Utopic:
  Fix Released

Bug description:
  [Impact] 
   * Black screen when attempting to rotating external display in affected configurations.

  [Test Case]
   * Run a system with a internal nvidia card, and 2 displays on the intel card. (Usually LCD screen + external VGA/DVI screen.)
   * Run xrandr --output <external> --rotate left
   * Expect a normal, rotated screen.
   * Bad behavior is a black screen.

  [Regression Potential] 
   * Low, only affects the transformed case in optimus mode, but it will be tested against !optimus config too.

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