From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:34904 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729831AbeIMTJn (ORCPT ); Thu, 13 Sep 2018 15:09:43 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, David Francis , Harry Wentland , Bhawanpreet Lakha , Alex Deucher , Sasha Levin Subject: [PATCH 4.18 129/197] drm/amd/display: Read back max backlight value at boot Date: Thu, 13 Sep 2018 15:31:18 +0200 Message-Id: <20180913131846.711053417@linuxfoundation.org> In-Reply-To: <20180913131841.568116777@linuxfoundation.org> References: <20180913131841.568116777@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: 4.18-stable review patch. If anyone has any objections, please let me know. ------------------ 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 Signed-off-by: Greg Kroah-Hartman --- 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",