Comment # 142 on bug 79980 from Jacob

(In reply to Michel Dänzer from comment #141)
> (In reply to Jacob from comment #137)
> > It seems to happen on any kernel newer than 3.13, least in my case.
> 
> Can you bisect which change between 3.13 and 3.14 caused the instability for
> you?

I've only downloaded kernel images as .deb files from
http://kernel.ubuntu.com/~kernel-ppa/mainline/
How would I go about bisecting which change caused the instability?