Comment 15 for bug 421250

some workaround:
I added "options snd_hda_intel model=laptop" to the end of
"/etc/modprobe.d/alsa-base.conf"

After each reboot execute:
killall pulseaudio
sudo alsa force-reload

If problem with microphone:
install some alsamixer and adjust microphone
In my case microphone didn't work before adjustments....