[Intel-gfx] [patch] PCI ID review

[Chris Wilson]

Quoting Alexei Podtelezhnikov (2020-04-27 15:40:42)
> >
> > These do not exist. They are fake PCI-ID for Windows95 multi monitor.
> > The single device appears twice on the bus as a second function. We
> > never had that restriction and could do multiple monitors on the single
> > device.
> 
> Windows 10 drivers list them, they do show up on lspci and I'll quote
> from Atom datasheet.
> "This register is unique in Function 1 (the Function 0 DID is
> separate). This difference in Device ID is necessary for allowing
> distinct Plug and Play enumeration of function 1 when both function 0
> and function 1 have the same class code."
> Whatever this means.

It means it's a hack for the Window's driver. There is no HW behind it.
-Chris