** Changed in: oem-priority
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/1564156
Title:
xenial: invalid opcode when using llvmpipe
Status in OEM Priority Project:
Fix Committed
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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