diff options
| author | Mario Limonciello <mario.limonciello@amd.com> | 2025-02-22 23:37:32 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-03-22 12:54:24 -0700 |
| commit | 9826fd36ff20f3b404f8e3ece24ddfc5ec750933 (patch) | |
| tree | 25e7497f0a77a417fc6c12b05a667e59fd7d6a06 | |
| parent | d1227b94d75c8db09355c91eeb3c204272ee221a (diff) | |
drm/amd/display: fix default brightness
commit b5a981e1b34e44f94a5967f730fff4166f2101e8 upstream.
[Why]
To avoid flickering during boot default brightness level set by BIOS
should be maintained for as much of the boot as feasible.
commit 2fe87f54abdc ("drm/amd/display: Set default brightness according
to ACPI") attempted to set the right levels for AC vs DC, but brightness
still got reset to maximum level in initialization code for
setup_backlight_device().
[How]
Remove the hardcoded initialization in setup_backlight_device() and
instead program brightness value to match BIOS (AC or DC). This avoids a
brightness flicker from kernel changing the value. Userspace may however
still change it during boot.
Fixes: 2fe87f54abdc ("drm/amd/display: Set default brightness according to ACPI")
Acked-by: Wayne Lin <Wayne.Lin@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 0747acf3311229e22009bec4a9e7fc30c879e842)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 |
1 files changed, 1 insertions, 1 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 5df26f8937cc..440dc224019d 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -4822,6 +4822,7 @@ amdgpu_dm_register_backlight_device(struct amdgpu_dm_connector *aconnector) dm->backlight_dev[aconnector->bl_idx] = backlight_device_register(bl_name, aconnector->base.kdev, dm, &amdgpu_dm_backlight_ops, &props); + dm->brightness[aconnector->bl_idx] = props.brightness; if (IS_ERR(dm->backlight_dev[aconnector->bl_idx])) { DRM_ERROR("DM: Backlight registration failed!\n"); @@ -4889,7 +4890,6 @@ static void setup_backlight_device(struct amdgpu_display_manager *dm, aconnector->bl_idx = bl_idx; amdgpu_dm_update_backlight_caps(dm, bl_idx); - dm->brightness[bl_idx] = AMDGPU_MAX_BL_LEVEL; dm->backlight_link[bl_idx] = link; dm->num_of_edps++; |