Comment # 35 on bug 1202707 from Takashi Iwai

There is an update in the upstream firmware tree.  Could you check whether it
fixes your problem?
 
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/commit/?id=3c1662d9a546ab01e42a34aec30ca44965fa4d7d