(In reply to rmuncrief from comment #8)
> (In reply to Alex Deucher from comment #7)
> > Can you bisect to figure out what commit broke things for you?
> 
> Actually I remember doing that many years ago when I was a maintainer for
> Steam under wine. I'll look and see if I can find a current bisect tutorial
> and give it a try. Any links or tips you can give to help give me a quick
> start would be appreciated. I do remember it can take many days, which I'm
> willing to invest as I said. However the fewer days the better! :)

It's pretty straight forward.  Just google for "kernel git bisect howto".