Comment 3 for bug 1568772

I also have this problem.

It actually prevents restoring alsa mixer settings on boot.

The system starts with headphone muted. Using alsamixer, I can unmute and set headphones volume. Then I save the settings using alsactl store (also tried sudo alsactl store)
Preferences get saved in /var/lib/alsa/asound.state

But after reboot the headphones are muted again.
Running in a terminal alsactl restore or sudo alsactl restore unmutes the headphones and set their volume to the saved value, but adding alsactl restore in /etc/rc.local does not help.