From: Thomas Weißschuh linux@weissschuh.net
[ Upstream commit 916ecc0db336768d80e14ef28a8c64a775274f95 ]
The value of "min_input_signal" returned from ATIF on a Framework AMD 13 is "12". This leads to a fairly bright minimum display backlight.
Add a quirk to override that the minimum backlight PWM to "0" which leads to a much lower minimum brightness, which is still visible.
Tested on a Framework AMD 13 BIOS 3.05 with the matte panel.
Link: https://community.frame.work/t/25711/9 Link: https://community.frame.work/t/47036 Signed-off-by: Thomas Weißschuh linux@weissschuh.net Tested-by: Dustin L. Howett dustin@howett.net Reviewed-by: Mario Limonciello mario.limonciello@amd.com Reviewed-by: Harry Wentland harry.wentland@amd.com Signed-off-by: Mario Limonciello mario.limonciello@amd.com Link: https://patchwork.freedesktop.org/patch/msgid/20241111-amdgpu-min-backlight-... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/drm_panel_backlight_quirks.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/drm_panel_backlight_quirks.c b/drivers/gpu/drm/drm_panel_backlight_quirks.c index 6b8bbed77c7f1..f2aefff618ddb 100644 --- a/drivers/gpu/drm/drm_panel_backlight_quirks.c +++ b/drivers/gpu/drm/drm_panel_backlight_quirks.c @@ -17,6 +17,14 @@ struct drm_panel_min_backlight_quirk { };
static const struct drm_panel_min_backlight_quirk drm_panel_min_backlight_quirks[] = { + /* 13 inch matte panel */ + { + .dmi_match.field = DMI_BOARD_VENDOR, + .dmi_match.value = "Framework", + .ident.panel_id = drm_edid_encode_panel_id('B', 'O', 'E', 0x0bca), + .ident.name = "NE135FBM-N41", + .min_brightness = 0, + }, };
static bool drm_panel_min_backlight_quirk_matches(const struct drm_panel_min_backlight_quirk *quirk,