Comment 21 for bug 1438708

As I was unable to usefully bisect the ubuntu kernel, I tried again with the mainline kernels from http://kernel.ubuntu.com/~kernel-ppa/mainline/

This gave a much clearer result:

http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.14.37-utopic/ -- works
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.15-rc1-trusty/ -- crashes on bootup

I was also able to reproduce a crash on bootup with:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.15-rc4-utopic/
-and-
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.15-utopic/

Thanks,
Geoff