[Devel] [PATCH vz9] drm: Disable modeset by default

[Denis V. Lunev]

On 2/9/24 19:47, Konstantin Khorenko wrote:
> 1. VHS and HCI are server products => nice graphical console output is not
>     that important.
> 2. QXL driver is buggy, we face issues with L1 VMs hungs during console writing
>     using QXL driver.
>
> => let's disable framebuffer by default (like we always have "nomodeset"
> kernel boot option set).
>
> To reverse the situation, we add "modeset" kernel boot option which
> enables back framebuffer drivers usage.
>
> https://pmc.acronis.work/browse/VSTOR-81614
>
> Signed-off-by: Konstantin Khorenko <khorenko at virtuozzo.com>
> ---
>   drivers/video/nomodeset.c | 13 ++++++++++++-
>   1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/video/nomodeset.c b/drivers/video/nomodeset.c
> index 13cc8b719697..1ee9c29d185b 100644
> --- a/drivers/video/nomodeset.c
> +++ b/drivers/video/nomodeset.c
> @@ -5,7 +5,7 @@
>   
>   #include <video/nomodeset.h>
>   
> -static bool video_nomodeset;
> +static bool video_nomodeset = true;
>   
>   bool video_firmware_drivers_only(void)
>   {
> @@ -22,5 +22,16 @@ static int __init disable_modeset(char *str)
>   	return 1;
>   }
>   
> +static int __init enable_modeset(char *str)
> +{
> +	video_nomodeset = false;
> +
> +	pr_warn("Booted with the modeset parameter. Full framebuffer support is enabled\n");
> +
> +	return 1;
> +}
> +
>   /* Disable kernel modesetting */
>   __setup("nomodeset", disable_modeset);
> +/* Enable kernel modesetting */
> +__setup("modeset", enable_modeset);
Ack