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[Launchpad Bug Tracker <1401784@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package xserver-xorg-video-intel -
2:2.99.914-1~exp1ubuntu4.2

---------------
xserver-xorg-video-intel (2:2.99.914-1~exp1ubuntu4.2) utopic-proposed; urgency=medium

  [ Timo Aaltonen ]
  * Added patches:
    - disable-dri3.diff: Disable DRI3. (LP: #1401784)
    - sna-fix-gen8-blt.diff,
      sna-add-more-checks-and-asserts-for-blt.diff,
      sna-tweak-alignment-constraints-on-gen8.diff:
      Fix GEN8 BLT with 4bit address. (LP: #1401788)
  [ Maarten Lankhorst ]
  * 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 17:16:49 +0100

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

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https://bugs.launchpad.net/bugs/1401784

Title:
  Disable DRI3

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

Bug description:
  [Impact]
  from the upstream commit:

  "The external libraries, both in git, and especially shipping already
      enabled in distributions, are buggy and lead to server crashes and
      lockups. Caveat emptor."

  so disable it by default in vivid and utopic.

  [Test case]
  grep DRI3 /var/log/Xorg.0.log
  should not return anything

  [Regression potential]
  none

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