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

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Date:   Thu, 7 Sep 2023 14:43:56 +0200
From:   Christian König <christian.koenig@....com>
To:     suijingfeng <suijingfeng@...ngson.cn>,
        Sui Jingfeng <sui.jingfeng@...ux.dev>,
        Christian König <ckoenig.leichtzumerken@...il.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Daniel Vetter <daniel@...ll.ch>,
        "Deucher, Alexander" <Alexander.Deucher@....com>
Cc:     nouveau@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-pci@...r.kernel.org
Subject: Re: [Nouveau] [RFC, drm-misc-next v4 0/9] PCI/VGA: Allowing the user
 to select the primary video adapter at boot time

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/
>