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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Message-ID: <5d9f9780-995f-33dc-e3db-3112aa085062@loongson.cn>
Date:   Thu, 7 Sep 2023 20:32:19 +0800
From:   suijingfeng <suijingfeng@...ngson.cn>
To:     Christian König <christian.koenig@....com>,
        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

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?

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