---- On Sun, 24 Aug 2025 21:02:02 +0100 Antheas Kapenekakis
<l...@antheas.dev> wrote ---
> On the SteamOS kernel, Valve universally makes minimum brightness 0
> for all devices. SteamOS is (was?) meant for the Steam Deck, so
> enabling it universally is reasonable. However, it causes issues in
> certain devices. Therefore, introduce it just for the Steam Deck here.
>
> SteamOS kernel does not have a public mirror, but this replaces commit
> 806dd74bb225 ("amd/drm: override backlight min value from 12 -> 0")
> in the latest, as of this writing, SteamOS kernel (6.11.11-valve24).
> See unofficial mirror reconstructed from sources below.
>
> Link: https://gitlab.com/evlaV/linux-integration/-/commit/806dd74bb225
> Signed-off-by: Antheas Kapenekakis <l...@antheas.dev>
> ---
> drivers/gpu/drm/drm_panel_backlight_quirks.c | 17 ++++++++++++++++-
> 1 file changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_panel_backlight_quirks.c
> b/drivers/gpu/drm/drm_panel_backlight_quirks.c
> index 78c430b07d6a..5c24f4a86519 100644
> --- a/drivers/gpu/drm/drm_panel_backlight_quirks.c
> +++ b/drivers/gpu/drm/drm_panel_backlight_quirks.c
> @@ -73,7 +73,22 @@ static const struct drm_get_panel_backlight_quirk
> drm_panel_min_backlight_quirks
> .dmi_match_other.field = DMI_PRODUCT_NAME,
> .dmi_match_other.value = "ONEXPLAYER F1 EVA-02",
> .quirk = { .brightness_mask = 3, },
> - }
> + },
> + /* Steam Deck models */
> + {
> + .dmi_match.field = DMI_SYS_VENDOR,
> + .dmi_match.value = "Valve",
> + .dmi_match_other.field = DMI_PRODUCT_NAME,
> + .dmi_match_other.value = "Jupiter",
> + .quirk = { .min_brightness = 1, },
> + },
> + {
> + .dmi_match.field = DMI_SYS_VENDOR,
> + .dmi_match.value = "Valve",
> + .dmi_match_other.field = DMI_PRODUCT_NAME,
> + .dmi_match_other.value = "Galileo",
> + .quirk = { .min_brightness = 1, },
> + },
> };
>
> static bool drm_panel_min_backlight_quirk_matches(
> --
> 2.50.1
>
Reviewed-by: Robert Beckett <bob.beck...@collabora.com>
