linux-kernel - Re: [PATCH v3 5/6] Documentation/admin-guide: Document nomodeset kernel parameter

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Date:   Mon, 8 Nov 2021 13:48:24 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Javier Martinez Canillas <javierm@...hat.com>,
        linux-kernel@...r.kernel.org
Cc:     dri-devel@...ts.freedesktop.org,
        Jani Nikula <jani.nikula@...el.com>,
        Peter Robinson <pbrobinson@...il.com>,
        Michel Dänzer <michel@...nzer.net>,
        Pekka Paalanen <pekka.paalanen@...labora.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>
Subject: Re: [PATCH v3 5/6] Documentation/admin-guide: Document nomodeset
 kernel parameter

Hi

Am 08.11.21 um 13:15 schrieb Javier Martinez Canillas:
> The nomodeset kernel command line parameter is not documented. Its name
> is quite vague and is not intuitive what's the behaviour when it is set.
> 
> Document in kernel-parameters.txt what actually happens when nomodeset
> is used. That way, users could know if they want to enable this option.
> 
> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
> ---
> 
> (no changes since v1)
> 
>   Documentation/admin-guide/kernel-parameters.txt | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git Documentation/admin-guide/kernel-parameters.txt Documentation/admin-guide/kernel-parameters.txt
> index 91ba391f9b32..ed9859fd0734 100644
> --- Documentation/admin-guide/kernel-parameters.txt
> +++ Documentation/admin-guide/kernel-parameters.txt
> @@ -3521,6 +3521,10 @@
>   			shutdown the other cpus.  Instead use the REBOOT_VECTOR
>   			irq.
>   
> +	nomodeset	Disable kernel modesetting. DRM drivers will not be
> +			loaded when this kernel boot parameter is used. The
> +			simpledrm driver is the only DRM driver that loads.
> +

That's misleading and to the general admin it might not be clear what 
simpledrm is about. Rather say something like

  Disable kernel modesetting. DRM drivers will not perform
  display-mode changes or accelerated rendering. Only the
  system framebuffer will be available for use. Requires the
  firmware or boot loader to setup the display. Useful as
  fallback, or for testing and debugging.

Best regards
Thomas

>   	nomodule	Disable module load
>   
>   	nopat		[X86] Disable PAT (page attribute table extension of
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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