From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 849C821B9C0; Wed, 19 Mar 2025 14:38:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742395118; cv=none; b=PGU4qOlUWlAb6LVt4kuQPzS3HvJsxMtBQ7xAcHh6/XYo5wLgK/e9xwOYQ7dY8h6rsM3/qYzlK9Jyn42tWW7iP7PFY/FPcA+8RgTyOZ4mNzbfbjBWzBDg9nc3y5nNBPEM/VwGkJF9PxSnpINrik5ixrKKmB+Is3V292CED6NNojY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742395118; c=relaxed/simple; bh=E/YjpBNM8ezPnqLCQEMZe4umP1eJ/kT6pP1Kqms2Q9A=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=XPvzzrLMxd8VvwxuN6yFQ93jx6sLSVAH002due6H5Uf3sXmRWC1QU0YIhKH8yr2WKVjTo6XLMpOlHJ0G8RIOY4xh1cqpKIgM4JemhxwjOVebyeYerGA+8/fFMqAuo6idRfba9JoNcOkFSW4gat87mZ3ahQriNI6kEm3vtPu4Ci8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=vNujpLVk; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="vNujpLVk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 52050C4CEE4; Wed, 19 Mar 2025 14:38:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1742395118; bh=E/YjpBNM8ezPnqLCQEMZe4umP1eJ/kT6pP1Kqms2Q9A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vNujpLVk0xcM0FjU0k8TSFo+G5HzwvVhulX2DbjolrJimtA4lnWMfs5+o6NBUCmb4 lFo19IGgggXDaXQyRn0uILsjFSDXaYLCohJ5r3oNuJ+pWUtOT7P19T1BAgD1qBlba2 ide6t4k4Dq3C10SeGMJ+WeZ2OQVL0Npqi9AB54p4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Wayne Lin , Mario Limonciello , Tom Chung , Daniel Wheeler , Alex Deucher Subject: [PATCH 6.12 178/231] drm/amd/display: fix default brightness Date: Wed, 19 Mar 2025 07:31:11 -0700 Message-ID: <20250319143031.235605244@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250319143026.865956961@linuxfoundation.org> References: <20250319143026.865956961@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mario Limonciello 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 Signed-off-by: Mario Limonciello Signed-off-by: Tom Chung Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher (cherry picked from commit 0747acf3311229e22009bec4a9e7fc30c879e842) Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- 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(stru 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(struc 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++;