Re: [Nouveau] [RFC, drm-misc-next v4 0/9] PCI/VGA: Allowing the user to select the primary video adapter at boot time

[Christian König]

Am 07.09.23 um 14:32 schrieb suijingfeng:
> Hi,
>
>
> On 2023/9/7 17:08, Christian König wrote:
> > Well, I have over 25 years of experience with display hardware and 
> > what you describe here was never an issue. 
>
> I want to give you an example to let you know more.
>
> I have a ASRock AD2550B-ITX board[1],
> When another discrete video card is mounted into it mini PCIe slot or 
> PCI slot,
> The IGD cannot be the primary display adapter anymore. The display is 
> totally black.
> I have try to draft a few trivial patch to help fix this[2].
>
> And I want to use the IGD as primary, does this count as an issue?

No, this is completely expected behavior and a limitation of the 
hardware design.

As far as I know both AMD and Intel GPUs work the same here.

Regards,
Christian.

> [1] https://www.asrock.com/mb/Intel/AD2550-ITX/
> [2] https://patchwork.freedesktop.org/series/123073/