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[Launchpad Bug Tracker <1401788@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package xserver-xorg-video-intel -
2:2.99.916+git20141119-1~exp1ubuntu1

---------------
xserver-xorg-video-intel (2:2.99.916+git20141119-1~exp1ubuntu1) vivid; urgency=medium

  * Merge from debian experimental (LP: #1401784, #1401788)
  * Drop upstream patches.

xserver-xorg-video-intel (2:2.99.916+git20141119-1~exp1) experimental;
urgency=medium

  * New upstream snapshot.

xserver-xorg-video-intel (2:2.99.916-1~exp1) experimental;
urgency=medium

  [ Vincent Cheng ]
  * New upstream prerelease 2.99.916.
    - sna: Add the current CRTC mode last (Closes: #750605)
  * Update debian/copyright. (Closes: #730643)
  * Revert to source format 1.0.

  [ Laurent Bigonville ]
  * debian/xserver-xorg-video-intel.maintscript: Explicitly remove
    i915-kms.conf on upgrade. (Closes: #713340)
 -- Timo Aaltonen <tjaalton@xxxxxxxxxx>   Fri, 12 Dec 2014 09:24:52 +0200

** Changed in: xserver-xorg-video-intel (Ubuntu Vivid)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1401788

Title:
  backport BDW/CHV sna BLT fix

Status in X.org xf86-video-intel:
  Unknown
Status in xserver-xorg-video-intel package in Ubuntu:
  Fix Released
Status in xserver-xorg-video-intel source package in Trusty:
  New
Status in xserver-xorg-video-intel source package in Utopic:
  New
Status in xserver-xorg-video-intel source package in Vivid:
  Fix Released

Bug description:
  commit 3a22b6f6d55a5b1e0a1c0a3d597996268ed439ad
  Author: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
  Date:   Wed Nov 19 15:10:05 2014 +0200

      sna: gen8 BLT broken when address has bit 4 set
      
      With bit 4 set in address, the gen8 blitter fails and blits errorneously
      into the cacheline preceeding the destination and similarly when reading from
      the source, corrupting memory.
      
      v2: Update the destination base offset pattern as revealed
          by igt/tests/gem_userptr_blits/destination-bo-align
      
      v3: Check base address as well
      
      Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=79053

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