Comment # 6 on bug 937628 from Alfonso Garcia

(In reply to Takashi Iwai from comment #5)
> Did you install the latest kernel-firmware package?

No, it is using the same firmware packages as the 4.0 and 3.xx kernel versions.
I wasn't aware of an specific firmware package needed, and I assumed that
having kernel 4.0 working without needing additional packages I was not going
to need one for 4.1 either. I can't try until next week, but if you give a link
to the updated firmware package I'll try it next week.