Comment # 73 on bug 91880 from Alex Deucher

(In reply to Julian from comment #72)
> (In reply to Alex Deucher from comment #71)
> > Can you also test with the code and firmware from comment 32?
> 
> To clarify, do you mean only with the code from
> http://cgit.freedesktop.org/~agd5f/linux/commit/?h=new_smc or the whole
> kernel under agd5f?

Either use the kernel from that branch or cherry-pick the top 4 commits to
whatever kernel you want to use and then install the new firmware files.