Need help with chipset for Intel i915PM/GM

Hello fellow techies! I been trying to troubleshoot a client’s laptop and trying to find the drivers for it. It’s a custom laptop, older model and the specs for this are:

Motherboard: Quanta MW1/HW1
Chipset: Intel i915/PM/GM aka alviso
Southbridge: 82801FBM

My question is, I been looking all over the place for this chipset. I cannot find it for the best of me. I looked through Intel, HP, even Packard Bell which claimed to have it but don’t. Anyone know about this particular chipset and where I may find it? Help is much appreciated!