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 C034B3B19AB for ; Fri, 5 Jun 2026 21:08:44 +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=1780693724; cv=none; b=YT2uI/Xoc3WFhTF0R57KTsMaVHPOPEfGFLZR9o6Vqy8J4j+A0ps8EAIkP61cbtfV7jcaeSaVHxnHMVipsHDU6GRBGIZ4LGePqhntbCUR1XD+wCVhAa+3QfNwtzt5hZIw5YWrRXGmocrPpXKNuVaWI1iGZYMtP8vRF+BYMaVsxi4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780693724; c=relaxed/simple; bh=+4M6MAb5V1qnKeiE0Ljys5K1MneHtdxVzCjBvcwY2f0=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=l1Gqe7dvXv+Es2xhQlAsLnEqbSpk6kKX94YAf0X/JTIqy3VyfAXsEMBVo4N7V7xxrWHDsnAM9MSssIjiXhtm22nIB9B5Noodw65TqZHa51QStAusRVP3Ek25HXhVwwIUtNqzfPAAyQLNC2WQdhc+hNl0aXhrS/k6qLxpXoM+NB8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=M3mJaM97; 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="M3mJaM97" Received: by smtp.kernel.org (Postfix) with ESMTPS id 47223C2BCB4 for ; Fri, 5 Jun 2026 21:08:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1780693724; bh=+4M6MAb5V1qnKeiE0Ljys5K1MneHtdxVzCjBvcwY2f0=; h=From:To:Subject:Date:In-Reply-To:References:From; b=M3mJaM97bdDKswhnUiWEPVk/+2kEWsvXkxpV9Fncbua3eOZEqp6rsfpC/qsMUjcIq 6TKdAPFp9HhaU4btX6eWT5gRPQJ6h2H1c6UPVJZoDEW9fRT7pKkpnVpsRAdUvA3wdd XARX2KejFRrzy4dU0cs9UOzdYPld8xqf5O/861IgQeWo3Y+QNciJj7rWTMMmlu24kj N5RE8noUExHuuroAVi2AwnTMiVL/QL5EafWmFk6ehhi0Q+fC7DMU3jitJH+eehNuub eaYXIT77KRF2NTfLTbYG3rSB7OQqE3F+o5cVJqj/diMyGPVEaOQHSx4CgruHhd43pX 5DcGKUj3mECmQ== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 2BBDAC3279F; Fri, 5 Jun 2026 21:08:44 +0000 (UTC) From: bugzilla-daemon@kernel.org To: platform-driver-x86@vger.kernel.org Subject: [Bug 221583] Lenovo 82KU: keyboard backlight works via Fn+Space but no kbd_backlight LED device exposed Date: Fri, 05 Jun 2026 21:08:44 +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: george.stafilidis@proton.me 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=3D221583 --- Comment #26 from George (george.stafilidis@proton.me) --- Hi Rong, I did the lid test exactly as you asked. I set the keyboard brightness to H= igh using Fn+Space. When I closed the lid, the keyboard light turned off after about 5 seconds. When I opened the lid again, the light turned back on at H= igh. (Closing the lid when the keyboard light is off does not turn it open when i open the lid) I also ran the diff command on the MMIO dumps before closing and after open= ing the lid. The output is: 2c2 < 0x00000000FE00D401: 00010000 --- > 0x00000000FE00D401: 00000001 7c7 < 0x00000000FE00D406: 00011100 --- > 0x00000000FE00D406: 00011010 177,178c177,178 < 0x00000000FE00D4B0: 00110010 < 0x00000000FE00D4B1: 00101100 --- > 0x00000000FE00D4B0: 00100110 > 0x00000000FE00D4B1: 00101010 184c184 < 0x00000000FE00D4B7: 00101000 --- > 0x00000000FE00D4B7: 00100111 199c199 < 0x00000000FE00D4C6: 00010010 --- > 0x00000000FE00D4C6: 00010011 I also did the manual test of register 0x8A as yoy asked Step 3 (KBLO =3D 0, KLFS =3D 0): the light turned OFF Step 4 (KBLO =3D 0, KLFS =3D 1): the light did not turn ON Step 5 (KBLO =3D 1, KLFS =3D 0): the light turns ON at LOW brightness Step 6 (KBLO =3D 1, KLFS =3D 1): the light stays at LOW brightness Hopefully i got everything correct. I am also attaching the stock dsdt. Oh yeah also Bios info: Version: GLCN68WW Release Date: 03/19/2025 Have a wonderful night! --=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.=