** Description changed: [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.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1564156 Title: xenial: invalid opcode when using llvmpipe To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1564156/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
