From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-co1nam03on0118.outbound.protection.outlook.com ([104.47.40.118]:6016 "EHLO NAM03-CO1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727340AbeH3WMI (ORCPT ); Thu, 30 Aug 2018 18:12:08 -0400 From: Sasha Levin To: "stable@vger.kernel.org" CC: David Francis , Alex Deucher , Sasha Levin Subject: [PATCH AUTOSEL 4.18 100/113] drm/amd/display: Read back max backlight value at boot Date: Thu, 30 Aug 2018 18:08:19 +0000 Message-ID: <20180830180714.36167-34-alexander.levin@microsoft.com> References: <20180830180714.36167-1-alexander.levin@microsoft.com> In-Reply-To: <20180830180714.36167-1-alexander.levin@microsoft.com> Content-Language: en-US Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org List-ID: From: David Francis [ 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 Reviewed-by: Harry Wentland Acked-by: Bhawanpreet Lakha Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gp= u/drm/amd/display/amdgpu_dm/amdgpu_dm.c index 770c6b24be0b..a1d90331a903 100644 --- 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(struct amdgpu_dis= play_manager *dm) struct backlight_properties props =3D { 0 }; =20 props.max_brightness =3D AMDGPU_MAX_BL_LEVEL; + props.brightness =3D AMDGPU_MAX_BL_LEVEL; props.type =3D BACKLIGHT_RAW; =20 snprintf(bl_name, sizeof(bl_name), "amdgpu_bl%d", --=20 2.17.1