http://askubuntu.com – I use Ubuntu 12.04 on Asus N56VZ, the subwoofer used to work doing the following trick advised by Sami: a. Add to rc.local echo 0x1e 0x99130112 > /sys/class/sound/hwC0D0/user_pin_configs echo 1 > /sys/class/sound/hwC0D0/reconfig b. Add options snd-hda-intel model=asus-mode4 in /etc/modprobe.d/alsa-base.conf c. Reboot d. (HowTos)