Comment 6 for bug 1294456

try specify model=vaio in /etc/modprobe.d/alsa-base.conf

option snd-hda-Intel model=vaio

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda?id=fc268c10cadb4fb171381cd1fe04849877412e40

if it work, send email to the author to add your pci ssid 104d:81f4 to quirk