(In reply to Jarkko K from comment #0) > I got oibaf ppa. They started to use LLVM 3.6 compiler around that time I > started to have unstable dota. Was the LLVM version the only thing which changed in between, or also the version of the kernel and/or Mesa? If the latter, can you try isolating which component caused the problem? Please attach the actual dmesg output corresponding to the problem.