Audio, the 026CH device, I believe the other is on the video card.
Ethernet, the NVETH driver from the latest experimental MultiMac package (all I've tried)
USB, the mouse problems I described. Keyboard here is currently PS2. USB sticks seem really slow and I just trapped the system trying to copy some files to a JFS formatted stick. Doing a test install of ArcaOS 5.0.2.3 from a USB stick saw the ISO get lost a couple of times. Rebooting allowed the install to continue.
Model number, according to the BIOS, it is an XPS 630i, the service tag number is also there.