4.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: David Francis David.Francis@amd.com
[ Upstream commit 53a53f8687faf492df2644d8c18ff0217fc18730 ]
[Why] If there is no program explicitly setting the backlight brightness (for example, during a minimal install of linux), the hardware defaults to maximum brightness but the backlight_device defaults to 0 value. Thus, settings displays the wrong brightness value.
[How] When creating the backlight device, set brightness to max
Signed-off-by: David Francis David.Francis@amd.com Reviewed-by: Harry Wentland Harry.Wentland@amd.com Acked-by: Bhawanpreet Lakha Bhawanpreet.Lakha@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -1334,6 +1334,7 @@ amdgpu_dm_register_backlight_device(stru struct backlight_properties props = { 0 };
props.max_brightness = AMDGPU_MAX_BL_LEVEL; + props.brightness = AMDGPU_MAX_BL_LEVEL; props.type = BACKLIGHT_RAW;
snprintf(bl_name, sizeof(bl_name), "amdgpu_bl%d",