My Sager NP5791 headphones jack and Ubuntu 9.04
I couldn’t get my headphones jack working after installing Ubuntu 9.04 on my Sager. So, after some quick googling, I found that adding the following line at the end of the /etc/modprobe.d/alsa-base.conf file and rebooting fixed things right up:
options snd-hda-intel model=auto