Intel site gives audio drivers for Novell Linux & RedHat , not
for Debian.

I have tried with latest 'alsa' driver, still it did not rcognize
audio. ( Intel D915 GLVG M-board)

We  are  running Debian on Intel 915 machine and sound is working well with Debian.

I am not in office now. I will get back as soon as I reach office.