From: Kai-Heng Feng kai.heng.feng@canonical.com
commit bb264220d9316f6bd7c1fd84b8da398c93912931 upstream.
Laptops with AMD APU doesn't restore display backlight brightness after system resume.
This issue started when DC was introduced.
Let's use BL_CORE_SUSPENDRESUME so the backlight core calls update_status callback after system resume to restore the backlight level.
Tested on Dell Inspiron 3180 (Stoney Ridge) and Dell Latitude 5495 (Raven Ridge).
Cc: stable@vger.kernel.org Signed-off-by: Kai-Heng Feng kai.heng.feng@canonical.com Signed-off-by: Alex Deucher alexander.deucher@amd.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 @@ -1462,6 +1462,7 @@ static int amdgpu_dm_backlight_get_brigh }
static const struct backlight_ops amdgpu_dm_backlight_ops = { + .options = BL_CORE_SUSPENDRESUME, .get_brightness = amdgpu_dm_backlight_get_brightness, .update_status = amdgpu_dm_backlight_update_status, };