Most support Intel HDA.

The problem is that people don't use onboard audio anymore (because its incredibly and audibly noisy). They use USB or Bluetooth.

Bluetooth absolutely isn't standardized and is a mess, and USB miiiiiiight be okay if you limit to a subset of EHCI and USB Audio Class 1.0 devices.

At this point, its easier to just use Linux and run your game as pid 1.