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 3AC4239769A for ; Tue, 12 May 2026 09:47:54 +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=1778579275; cv=none; b=EN+ANAPgO7PBQve6Pa1kcqWHECP3dEQHI48ThEgWNHxwAWKBualDCsl5oWtOLvfypH8fzKAbHjrCJInTkDPXSSlE5WMGJ2HyVbYH18KZFms4bebn1rrCcHe2nznyszS/NZCL119VhTM3ce16visZit6cxzNzGWN7LtTgcNEkeMU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778579275; c=relaxed/simple; bh=XFIMY4Ox7luxP0r8VhgXPv9w9Ir0ujjS4plm1uWy8Fc=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=GXe3MH1KDeoV67Mem+gVc91TYQBHCDUKFWaoFAHTqBpRQ65Hn9BA2o9+X63+1uoFITW0qO06C6oUkpxDVqCsVwY+FVMhEWJC05sje3GyKAZzOhgtMUs4GE6DMdBHrOa71OUGbmg9w565S4a7H8jutmy/hjYUsS9UMWfENHetHng= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OQehAX4/; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="OQehAX4/" Received: by smtp.kernel.org (Postfix) with ESMTPS id CC1C7C2BCF6 for ; Tue, 12 May 2026 09:47:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778579274; bh=XFIMY4Ox7luxP0r8VhgXPv9w9Ir0ujjS4plm1uWy8Fc=; h=From:To:Subject:Date:In-Reply-To:References:From; b=OQehAX4/oB7sLU36LzTkhzr3CjNiCgETE/CJJVb4U03CeYLsEQJ7ZBt6oESih3jf0 wb7DsLtXZOQvg9XpeDqNGTOY+YwXDJDJ7uVxHb+SGazHri9pD9JJLZVchxSEK3X/Zx v/9Z36PJjN+skktL/D7ludJyncOzU2GgLNTmd04RJp7PjQApX11z6Jkld9zF8xg2OV N9EvGo8PjrVT1/XHNbD2jw3njgvhvjXTDuUGP5EKooRkfdt1DIyltACEYKgZT1ceoU I3ZdQM+fY3T8HPVIN9x/A/pbvxiduW0ERg8RUtMWtSsZHmUw5jUlExOcIegdVT5Jw8 k3ccnnrufjY6A== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id B426DC433E1; Tue, 12 May 2026 09:47:54 +0000 (UTC) From: bugzilla-daemon@kernel.org To: platform-driver-x86@vger.kernel.org Subject: [Bug 221430] nvidia_wmi_ec_backlight: brightness writes silently dropped on HP OMEN 16 (2025) Date: Tue, 12 May 2026 09:47:54 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: AssignedTo drivers_platform_x86@kernel-bugs.osdl.org X-Bugzilla-Product: Drivers X-Bugzilla-Component: Platform_x86 X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: hansg@kernel.org X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: drivers_platform_x86@kernel-bugs.osdl.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated Precedence: bulk X-Mailing-List: platform-driver-x86@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 https://bugzilla.kernel.org/show_bug.cgi?id=3D221430 --- Comment #8 from Hans de Goede (hansg@kernel.org) --- (In reply to floquimaurice from comment #7) > Hi Hans, >=20 > I added acpi_backlight=3Dnative nvidia_wmi_ec_backlight.force=3D1 (and > nvidia.NVreg_EnableBacklightHandler=3D0) to my kernel command line. >=20 > Here are the folders that appeared in /sys/class/backlight/: >=20 > intel_backlight (max_brightness: 192000) >=20 > nvidia_0 (max_brightness: 100) >=20 > nvidia_wmi_ec_backlight (max_brightness: 100) >=20 > I tried echoing different values into the brightness file for each of the= se > three folders. The commands were accepted without any errors, but the > physical screen brightness did not change at all. >=20 > I am just reporting the facts here. Let me know if you need me to run any > other specific commands or tests! Ok, so this is not a classic "which backlight driver should we use" problem. But rather some issue with one of the backlight drivers. The 192000 max-brightness for the intel_backlight looks suspicious. Assuming that the LCD panel is indeed being driven by the Intel GPU and not muxed to the nvidia GPU then I would start with filing a bug against the i9= 15 driver: https://drm.pages.freedesktop.org/intel-docs/how-to-file-i915-bugs.html What value did you select in the BIOS for the hybrid-GPU config ? If you selected discrete only instead of one of the hybrid options then this more likely is an nvidia driver issue... --=20 You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.=