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[Chris J Arges <1384289@xxxxxxxxxxxxxxxxxx>]

** Also affects: mesa (Ubuntu Utopic)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1384289

Title:
  mesa 10.3.1 required for mir

Status in “mesa” package in Ubuntu:
  Fix Released
Status in “mesa” source package in Utopic:
  New

Bug description:
  There is a bugfix in 10.3.1 that will fix dma-buf handling in i915. So
  we would like to see the newest minor release of mesa, which is 10.3.1
  This will fix:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1275398 and
  basically enable i915 devices to run mir.

  [Impact]

   * The bug leads to crashes in unity8 on i915 and to crashes or 'black
  buffers' on mir clients.

   * This is not a request for back porting but a request to pick the
  next minor bugfix release of mesa.

  [Test Case]

   * Install mir-demos on a intel atom netbook or a pentium d system
   * sudo mir_demo_server_basic --vt 2 --file /tmp/mir_socket
   * sudo chmod 666 /tmp/mir_socket
   * mir_demo_client_egltriangle -m /tmp/mir_socket
   * then vt switch to vt 1
   Expected: Animation
   Observed: Crashing or just showing a black buffer

  [Regression Potential]

   * Instead of immediately crashing unity8s desktop session it will
  make the primary client of unity8: unity8-dash fail to start due to
  insufficient GL support on the mesa driver - but that is a different
  error.

   * 10.3.1 introduces the bespoke i915 bug fix, and further driver local fixes to nouveau for the kepler ir, shutdown leak fixes for radeon and a division by zero fix for llvmpipe. A fix to glsl that first manifested in i965. Apart from that build system cleanups for building mesa for android and detecting LLVM.
   * the fix to glsl has impact on i965
   * fixes for intel are local to i915 and will not cause regression
   * fixes to radeon should only touch shutdown code
   * fixes to nouveau should be local to kepler gpus

  [Other Info]

   * The switch to this mesa release will not enable mir. But it will
  not enable unity8 on pentium D and atom, but it will be a step towards
  that

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