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[Launchpad Bug Tracker <1727401@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package mesa - 17.2.4-0ubuntu1~16.04.4

---------------
mesa (17.2.4-0ubuntu1~16.04.4) xenial; urgency=medium

  * control: Relax mesa-opencl-icd dependency on libclc. (LP: #1743018)

mesa (17.2.4-0ubuntu1~16.04.3) xenial; urgency=medium

  * i965-disable-l3-cache-alloc-for-ext-buffers.diff:
    - Replaced with five backported commits from upstream
      (LP: #1727401, #1735594)

 -- Timo Aaltonen <tjaalton@xxxxxxxxxx>  Sat, 13 Jan 2018 09:06:08 +0200

** Changed in: mesa (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1727401

Title:
  Corruption on windowed 3D apps running on dGPU (Intel/AMD)

Status in Mesa:
  In Progress
Status in OEM Priority Project:
  Triaged
Status in mesa package in Ubuntu:
  Fix Committed
Status in mesa source package in Xenial:
  Fix Released
Status in mesa source package in Artful:
  Fix Released

Bug description:
  [Impact]

  Corruption is seen on windowed 3D apps running on dGPU

  [Test case]

  Get a certain Intel/AMD hybrid machine, run 'DRI_PRIME=1 glxgears',
  see how the window has corrupted gfx.

  The fix is to patch Intel i965_dri driver.

  [Regression potential]

  There could be a slight loss of performance, but corruption free
  behaviour.

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