Play MP3 and fixing ACER Aspire 4715z audio front panel

Ubuntu 7.10 doesn't come with ability to play multimedia file except *.ogg (theora and vorbis). if you want it badly to play mp3 file this are the steps...

install xmms
# sudo apt-get install xmms

now you can play your *.mp3 file. but wait... there is some problem, the song you are playing doesn't mute when you plugged you earphones... to fix this problem is simple...all you need to do is

1. install linux-backports-modules-generic
   ex:
   # sudo apt-get install linux-backports-modules-generic
2. append this line "options snd-hda-intel model=acer" to "/etc/modprobe.d/alsa-base"
   ex:
   echo "options snd-hda-intel model=acer" | sudo tee -a /etc/modprobe.d/alsa-base
   

done! now you can listen to your music with internal speaker or using headphones...