[Nouveau] Rewriting Intel PCI bridge prefetch base address bits solves nvidia graphics issues

[Daniel Drake]

On Thu, Aug 30, 2018 at 5:40 PM, Peter Wu <peter at lekensteyn.nl> wrote:
> As the BIOS date is not visible, can you also confirm that this message
> is visible in dmesg?
>
>    nouveau: detected PR support, will not use DSM

Yes, that gets logged.

> For laptops, it appears that you have to do at least two things:
> - Ensure that the Subsystem Vendor/Product ID are set.
> - Expose a _ROM ACPI method that provides VBIOS.
>
> Perhaps you also need to provide a "_DSM" method that emulates at least
> the "Optimus" interface for GUID a486d8f8-0bda-471b-a72b-6042a6b5bee0.
>
> You probably lost interest here, but if you want to continue anyway this
> is what allowed me to install the driver on the XPS 9560:
> https://github.com/Lekensteyn/acpi-stuff/blob/master/d3test/fakedev.asl

Indeed. I'm going to submit the workaround and I'll look to come back
to this qemu/vfio analysis later.

Thanks
Daniel