Mir

Comment 17 for bug 1540731

Thanks for testing, Alan. Can you give 4.5-rc5 a try? It can be downloaded from:
v4.4-rc4: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4-rc5-wily/

I'll setup a system and see if I can reproduce this. If I can , I'll bisect it.