% cat /etc/modprobe.d/sound
alias snd-card-0 snd-hda-intel
options snd-hda-intel index=0 position_fix=1 model=3stack
speaker-test -c2
speaker-test -c2 -tpink
speaker-test -c2 -tsine
speaker-test -c2 -twav
speaker-test -c2 -t2 -f240
speaker-test -c2 -t3
speaker-test -Dplug:front -c2
speaker-test -Dplug:front -c2 -t3