As a total newbie, I have just noticed that changing Master Volume does not change anything. For example, the volume level adjuster on upper right corner of the screen does not do anything. When I double-clicked there I figured out that changing master does not do anything but I can change the volume via PCM (whatever that is).
one thing I should note though I added "options snd-hda-intel model=auto" to the end of /etc/modprobe.d/alsa-base, to increase th volume level. It helped but it might cause this problem as well. (I am not sure whether Master Volume is working before my operation)
Edit: ANSWER: Apparently it is not a big deal. You can change the volume from PCM or Headphones; and the level of sound volume is good.
Last edited by sorrowsbitch
on Sun Jan 27, 2008 12:22 pm, edited 1 time in total.