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SubjectRe: [RFC] vgaarb: Add a module parm to use the first VGA device for boot
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Hi--

On 7/2/22 21:22, Cal Peake wrote:
> Hi,
>
> I have a dual GPU system with the GPU in the first CPU PCIe slot for the
> host and the GPU in the second CPU PCIe slot being passed through to a
> virtual machine.
>
> Currently, the VGA arbiter enumerates through all VGA devices in the order
> that they appear in on the bus with the last one ultimately getting the
> assignment for boot device.
>
> This is a problem because once the VFIO PCI driver claims the second GPU,
> all display output is lost -- just empty black screens on both cards.
>
> Setting VGA_ARB_MAX_GPUS to 1 helps a little: the X server will initialize
> on the first GPU like it should, but there's no VTs to be found (i.e.
> Alt-F1/F2/etc), just more black screens.
>
> Below is an attempt at a fix by creating a kernel param to have the VGA
> arbiter use the first VGA device it finds for the boot device and then
> subsequently ignore the rest for this task.

So that's
vgaarb.use_first=1
right?

Seems worthy of some documentation in
Documentation/admin-guide/kernel-parameters.txt, please.

--
~Randy

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