okay i recently installed ubuntu 8.04 on my alienware m15x and everything worked perfectly fine except for the sound. before i got sound out of my headphone jack but not out of the internal speakers. i followed the instructions here: http://ubuntuforums.org/showthread.php?t=739765 which had me add the line:
options snd-hda-intel model=mbp3
to /etc/modprobe.d/alsa-base. after restarting several times and waiting several days things magically started working. i can now get sound from my speakers but i just tried using a pair of headphones and i get no sound from the headphones. if i plug them in while music is playing sound will continue to come out of the speakers but no sound from the headphones.
can anyone help me?