From 8b5f3a229a70d242322b78c8e13744ca00212def Mon Sep 17 00:00:00 2001 From: Mario Limonciello Date: Wed, 14 May 2025 16:06:40 -0500 Subject: [PATCH] drm/amd/display: Fix default DC and AC levels [Why] DC and AC levels are advertised in a percentage, not a luminance. [How] Scale DC and AC levels to supported values. Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4221 Reviewed-by: Alex Hung Signed-off-by: Mario Limonciello Signed-off-by: Wayne Lin Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index 588f6afb1447..d3100f641ac6 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -4925,9 +4925,9 @@ amdgpu_dm_register_backlight_device(struct amdgpu_dm_connector *aconnector) amdgpu_acpi_get_backlight_caps(&caps); if (caps.caps_valid && get_brightness_range(&caps, &min, &max)) { if (power_supply_is_system_supplied() > 0) - props.brightness = caps.ac_level; + props.brightness = (max - min) * DIV_ROUND_CLOSEST(caps.ac_level, 100); else - props.brightness = caps.dc_level; + props.brightness = (max - min) * DIV_ROUND_CLOSEST(caps.dc_level, 100); /* min is zero, so max needs to be adjusted */ props.max_brightness = max - min; drm_dbg(drm, "Backlight caps: min: %d, max: %d, ac %d, dc %d\n", min, max, -- 2.39.5