My vivo laptop (VGN-FZ41E) was having problem in sound only in the jack (head phone). Built in speaker sound was fine but in the jack there is no sound. Thats why I need to install alsa in my ubuntu 8.04.
alsa-lib-1.0.xx alsa-utils-1.0.xx alsa-driver-1.0.xx
First compile alsa-lib
And lastly alsa-driver
thats and finally run alsaconf to install the drive.
Then it may be needed to make reboot the box. After that if this occurs again then may be needed to run alsaconf again.
***One thing I also add a line (options snd-hda-intel model=vaio) at the last of /etc/modprobe.d/alsa-base file.***