From bf0365b005d9a486d2ddf0c8ec0a578d0f3aabed Mon Sep 17 00:00:00 2001 From: Antheas Kapenekakis Date: Fri, 29 Aug 2025 16:55:40 +0200 Subject: [PATCH] drm: panel-backlight-quirks: Add Steam Deck brightness quirk 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 Reviewed-by: Robert Beckett Reviewed-by: Mario Limonciello Signed-off-by: Antheas Kapenekakis Link: https://lore.kernel.org/r/20250829145541.512671-6-lkml@antheas.dev Signed-off-by: Mario Limonciello (AMD) --- drivers/gpu/drm/drm_panel_backlight_quirks.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/gpu/drm/drm_panel_backlight_quirks.c b/drivers/gpu/drm/drm_panel_backlight_quirks.c index 2bdbd5583d323..537dc6dd05343 100644 --- a/drivers/gpu/drm/drm_panel_backlight_quirks.c +++ b/drivers/gpu/drm/drm_panel_backlight_quirks.c @@ -45,6 +45,21 @@ static const struct drm_get_panel_backlight_quirk drm_panel_min_backlight_quirks .ident.name = "NE135A1M-NY1", .quirk = { .min_brightness = 1, }, }, + /* 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, }, + }, /* Have OLED Panels with brightness issue when last byte is 0/1 */ { .dmi_match.field = DMI_SYS_VENDOR, -- 2.47.3