[Intel-gfx] [patch] PCI ID review

[Alexei Podtelezhnikov]

On Mon, Apr 27, 2020 at 10:45 AM Chris Wilson <chris at chris-wilson.co.uk> wrote:
>
> 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.

Intel talks about two separate engines (threads?)
https://www.intel.com/content/www/us/en/support/articles/000005880/graphics-drivers/legacy-graphics.html
https://www.intel.com/content/www/us/en/support/articles/000005747/graphics-drivers.html
Still not buying?