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 C665939060B; Tue, 12 May 2026 17:52:09 +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=1778608329; cv=none; b=KlPvGmgPg0VrFn+DAGHEqcqAgyzydS4KAZWVdL/vhR45o5rAUHCt4YTKHAj23qiRDP27KWHBaYVSaN7M8RHyhjROrXcIsDWYPMpFcuB7zFYp5TCPmUkWvP4+MHadWOAIiWCPhoLph7pHgIVX0ksiRy1painci1ABCXYqkyfTOOY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778608329; c=relaxed/simple; bh=E03tkfwWmiBX3xcgDfAkvfZDkHSNsvbpn4qG6NoR3xo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=nyFdf0enmuYOprA3z5A33QSYH2hMGd0UgkdDLuggSQ2FxmzntTZMfdEzAvEJoAvkyAxxsjJAFMG2YvCz/s0fFD7EC+Jtl+EWtavFF89xnddm2FfGqgKTrtkGouDi6Osf7eA6FGT4jskbuN02qFpD26/QqevHG54KDGS0M9iAM7M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=EwZt07sb; 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="EwZt07sb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5D752C2BCB0; Tue, 12 May 2026 17:52:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1778608329; bh=E03tkfwWmiBX3xcgDfAkvfZDkHSNsvbpn4qG6NoR3xo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EwZt07sbGmqBm/9PRsvWJCGohFQcXZeZVTWLmbE+SBYtTWpechkmpTG+a7sarJ5zj 6WweiMxo3UVRa314es021FM/k5QNjto/w/51Sj3fbQyPt4FeN/t6Vfmhud3i0NE3Rt xaytCOKBGVSI1YZZCA+/hRKFrjR7E9GxjVm5SCNU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Shivam Kalra , "Rafael J. Wysocki" Subject: [PATCH 6.18 009/270] ACPI: video: force native backlight on HP OMEN 16 (8A44) Date: Tue, 12 May 2026 19:36:50 +0200 Message-ID: <20260512173938.651255241@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260512173938.452574370@linuxfoundation.org> References: <20260512173938.452574370@linuxfoundation.org> User-Agent: quilt/0.69 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 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Shivam Kalra commit 4b506ea5351a1f5937ac632a4a5c35f6f796cc41 upstream. The HP OMEN 16 Gaming Laptop (board name 8A44) has a mux-less hybrid GPU configuration with AMD Rembrandt (Radeon 680M) and NVIDIA GA104 (RTX 3070 Ti). The internal eDP panel is wired to the AMD iGPU. When Nouveau loads without GSP firmware, the ACPI video backlight device (acpi_video0) gets registered alongside the native AMD backlight (amdgpu_bl2). In this state, writes to amdgpu_bl2 update the software brightness value but fail to change the physical panel brightness. Force native backlight to prevent acpi_video0 from registering. Confirmed that booting with acpi_backlight=native resolves the issue. Cc: All applicable Signed-off-by: Shivam Kalra Link: https://patch.msgid.link/20260426-omen-16-backlight-fix-v1-1-62364f268ea6@zohomail.in Signed-off-by: Rafael J. Wysocki Signed-off-by: Greg Kroah-Hartman --- drivers/acpi/video_detect.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/drivers/acpi/video_detect.c +++ b/drivers/acpi/video_detect.c @@ -907,6 +907,14 @@ static const struct dmi_system_id video_ DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 15 3535"), }, }, + { + .callback = video_detect_force_native, + /* HP OMEN Gaming Laptop 16-n0xxx */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "HP"), + DMI_MATCH(DMI_PRODUCT_NAME, "OMEN by HP Gaming Laptop 16-n0xxx"), + }, + }, /* * x86 android tablets which directly control the backlight through