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[System76 <1564156@xxxxxxxxxxxxxxxxxx>]

** Changed in: mesa (Ubuntu Xenial)
       Status: Confirmed => Invalid

** Changed in: mesa (Ubuntu)
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/1564156

Title:
  xenial: invalid opcode when using llvmpipe

Status in OEM Priority Project:
  Fix Released
Status in System76:
  Fix Released
Status in Release Notes for Ubuntu:
  Fix Released
Status in llvm-toolchain-3.8 package in Ubuntu:
  Fix Released
Status in mesa package in Ubuntu:
  Invalid
Status in llvm-toolchain-3.8 source package in Xenial:
  Fix Released
Status in mesa source package in Xenial:
  Invalid

Bug description:
  [Description updated to reflect state of 16.04 release ISO]

  == In summary ==

  If you have an Intel Skylake (6th gen) CPU and an NVIDIA GPU (or
  possibly other GPUs that likewise require use of the llvmpipe opengl
  software fallback), a work-around is needed to install Ubuntu 16.04
  desktop.

  To work-around this, you'll need to:

  1) Choose "Install Ubuntu" in the pre-boot menu (rather than "Try
  Ubuntu without installing")

  2) Check "Download updates while installing Ubuntu"

  ** Note: "Download updates while installing Ubuntu" doesn't currently
  seem to be working. If after installing 16.04 on effected Skylake
  hardware you find that Unity/Compiz is broken, switch to a VT with
  Control+Alt+F1, login, and then run:

  sudo apt-get update
  sudo apt-get dist-upgrade

  You should see the `libllvm3.8` package get updated. After a reboot,
  Unity/Compiz should be working.

  == In detail ==

  The Ubuntu 16.04 desktop ISOs include libllvm3.8 1:3.8-2ubuntu1, which
  has a bug that results in invalid JIT code generation when using the
  mesa llvmpipe opengl software fallback on Skylake CPUs.

  When you encounter this bug, Unity/Compiz will fail to start, and
  you'll see something like this in dmesg:

  [ 2092.557913] traps: compiz[10155] trap invalid opcode
  ip:7efc940030d4 sp:7ffccd914ea0 error:0

  libllvm3.8 1:3.8-2ubuntu3 fixes this issue, but the fix did not make
  it onto the 16.04 release ISOs. It will be included on the 16.04.1
  ISOs.

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