linux-kernel - Re: [PATCH] ACPI: Add DMI quirk for GIGABYTE GB-BXBT-2807

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Message-ID: <CAJZ5v0h4uMh5qfx5mKDq9+bSC9aUu4x8ivJh_0vmtt8A3htgKw@mail.gmail.com>
Date:   Mon, 7 Dec 2020 14:05:46 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Chris Chiu <chiu@...lessos.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux@...lessos.org, "Jasper St. Pierre" <jstpierre@...heye.net>
Subject: Re: [PATCH] ACPI: Add DMI quirk for GIGABYTE GB-BXBT-2807

On Wed, Dec 2, 2020 at 7:41 AM Chris Chiu <chiu@...lessos.org> wrote:
>
> From: "Jasper St. Pierre" <jstpierre@...heye.net>
>
> The GIGABYTE GB-BXBT-2807 is a mini-PC which uses off the shelf
> components, like an Intel GPU which is meant for mobile systems.
> As such, it, by default, has a backlight controller exposed.
>
> Unfortunately, the backlight controller only confuses userspace, which
> sees the existence of a backlight device node and has the unrealistic
> belief that there is actually a backlight there!
>
> Add a DMI quirk to force the backlight off on this system.
>
> Signed-off-by: Jasper St. Pierre <jstpierre@...heye.net>
> Reviewed-by: Chris Chiu <chiu@...lessos.org>
> ---
>  drivers/acpi/video_detect.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
> index 2499d7e3c710..ac2e194acdbf 100644
> --- a/drivers/acpi/video_detect.c
> +++ b/drivers/acpi/video_detect.c
> @@ -143,6 +143,13 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
>         },
>         {
>         .callback = video_detect_force_vendor,
> +       .ident = "GIGABYTE GB-BXBT-2807",
> +       .matches = {
> +               DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
> +               DMI_MATCH(DMI_PRODUCT_NAME, "GB-BXBT-2807"),
> +               },
> +       },
> +       {
>         .ident = "Sony VPCEH3U1E",
>         .matches = {
>                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
> --

Applied as 5.11 material, thanks!