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[Launchpad Bug Tracker <1471213@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package mesa-lts-vivid -
10.5.9-2ubuntu1~trusty2

---------------
mesa-lts-vivid (10.5.9-2ubuntu1~trusty2) trusty; urgency=medium

  * Backport vivid package for lts-vivid stack.

mesa (10.5.9-2ubuntu1~vivid2) vivid; urgency=medium

  * skl-dont-use-the-pma-depth-stall-workaround.diff: Fix GPU hangs in
    certain cases. (LP: #1486522)

mesa-lts-vivid (10.5.9-2ubuntu1~trusty1) trusty; urgency=medium

  * Backport vivid package for lts-vivid stack.

mesa (10.5.9-2ubuntu1~vivid1) vivid; urgency=medium

  * Backport to vivid. (LP: #1471213)

 -- Timo Aaltonen <tjaalton@xxxxxxxxxx>  Wed, 19 Aug 2015 21:37:31 +0300

** Changed in: mesa-lts-vivid (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1471213

Title:
  [SKL] noise in unity dash, torcs

Status in mesa package in Ubuntu:
  Fix Released
Status in mesa-lts-vivid package in Ubuntu:
  Invalid
Status in mesa-lts-vivid source package in Trusty:
  Fix Released
Status in mesa source package in Vivid:
  Fix Released

Bug description:
  [Impact]
  Intel Skylake GPU's suffers from noise seen in transparent unity dialogs, also visible in torcs for instance

  Need to backport four patches from 10.6.0:

  commit c02c4b567ce001f6605c46e71e089692b837bf26
  Author: Neil Roberts <neil@xxxxxxxxxxxxxxx>
  Date:   Wed Mar 4 14:13:40 2015 +0000

      i965: Store the GPU revision number in brw_context

  commit bc4b18d2977a94a6fb513bf5955236a0e92298ca
  Author: Neil Roberts <neil@xxxxxxxxxxxxxxx>
  Date:   Thu Mar 19 18:18:49 2015 +0000

      i965: Refactor SIMD16-to-2xSIMD8 checks.

  commit 484f9f4fcd53fcaa768e63934a5f74346bfb46a9
  Author: Dave Airlie <airlied@xxxxxxxxxx>
  Date:   Mon Mar 23 09:54:52 2015 +1000

      i965: define I915_PARAM_REVISION

  commit 706b916960c898cfc24110f14fa4def84caaba93
  Author: Kenneth Graunke <kenneth@xxxxxxxxxxxxx>
  Date:   Wed Mar 4 12:53:45 2015 -0800

      i965/skl: Break down SIMD16 3-source instructions when required.

  [Test case]
  Run something like Torcs on Skylake.

  [Regression potential]
  Slim, this only affects i965 driver for Intel, and the actual fix (706b916960c89) only affects gen9.

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