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[Bug 1564156] Re: xenial: invalid opcode when using llvmpipe

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Mathew Hodson <mathew.hodson@xxxxxxxxx>
Date: Fri, 22 Apr 2016 06:33:02 -0000
Reply-to: Bug 1564156 <1564156@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Also affects: ubuntu-release-notes
   Importance: Undecided
       Status: New

** Changed in: ubuntu-release-notes
       Status: New => Fix Released

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भाषा समायोजकहरुको समूह, which is subscribed to Xenial.
Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1564156

Title:
  xenial: invalid opcode when using llvmpipe

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

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 the above work-around wont work till 
  llvm-toolchain-3.8 1:3.8-2ubuntu3 lands in xenial-updates (it's currently only in xenial-proposed). FIXME: update description once this happens.

  == In detail ==

  The Ubuntu 16.04 desktop ISOs includes 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 ISO. It will be included on the 16.04.1 ISO.

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