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 303AB3E1D08 for ; Mon, 1 Jun 2026 18:06:34 +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=1780337194; cv=none; b=oCo1ZYD/aALFggu4bz4iu7mL3mQJICoAi3qhcMgz696+Jk/y2b3XH+/sLGlto2FH9Ja4AZ7mcj1SY5s77XFe17ebUF8kzyQia5fLuK55u+6HWttTltTaucLom3HNxC5Z0yfEC3AuEJAzFpCIe7nkJ88xhjGSzwpeaC7Fb5tpuIc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780337194; c=relaxed/simple; bh=zYbuXEk0nr0RTjPLQHYocKotpfASEKGCe5PeIm6rXeM=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=RgngRK3ES2vroq0DfL/EKu8UVAG3VgUARa1JSCkk4vLlJ0NY1NQT/9STUYXbETq/yg89MIaQ8g/PO2hbpLlOT7PDR1LZA83k9iR8cTK2x1YTjy9T8dkRBnJJWWOSrRDBCBKHBaUMGP8aYalEfVp36sWRK8lZwe8wCzXeXHASZBM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CWq89lbJ; 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="CWq89lbJ" Received: by smtp.kernel.org (Postfix) with ESMTPS id 008E4C2BCB8 for ; Mon, 1 Jun 2026 18:06:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1780337194; bh=zYbuXEk0nr0RTjPLQHYocKotpfASEKGCe5PeIm6rXeM=; h=From:To:Subject:Date:In-Reply-To:References:From; b=CWq89lbJgJTQE6qItjMT+GRQ99jC6xH1dwTA2OHdh17zhV02KhWJd5evXYsTR8YjB sb3pwepv1/Lvfo4g6wNIU5ln2Zbtr8r3PfAW+HSa1dX28RJDUx74yvgPfymR0B/71B BIAceHPTkvXPUU8Lc9yeWMf0Zw3+9xoFuPJruL44OVqnuav7vAxv6M1fL+K+LNxHWO s3YjrAqwTTf/9jbtgQYJnGtoLva7l23wHcwGlO4H5wI7x7zeoqay7qZYwj7VKWRg49 aMqiPLJhT/EKX4mQtykvKBVBQ8XunCVb4F8rieNESICPfUz9srFt47gmxb+3M/bs0K 7Wj8SYvMFWGVg== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id D68C7C3279F; Mon, 1 Jun 2026 18:06:33 +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: Mon, 01 Jun 2026 18:06:33 +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: attachments.created 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 #2 from George (george.stafilidis@proton.me) --- Created attachment 310234 --> https://bugzilla.kernel.org/attachment.cgi?id=3D310234&action=3Dedit acpidump Hi Rong, I checked `/sys/kernel/debug/ideapad/`. Directory contents: ```text $ sudo ls -l /sys/kernel/debug/ideapad total 0 -r--r--r--. 1 root root 0 Jun 1 17:23 cfg -r--r--r--. 1 root root 0 Jun 1 17:23 status ``` These are the only files present: ```text $ sudo find /sys/kernel/debug/ideapad -type f /sys/kernel/debug/ideapad/status /sys/kernel/debug/ideapad/cfg ``` Contents of `cfg`: ```text _CFG: 0xfe0d0018 Capabilities: bluetooth wifi camera OSD support: num-lock caps-lock mic-mute touchpad camera Graphics: ``` Contents of `status`: ```text Backlight max: 21 Backlight now: 17 BL power value: on (1) =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Radio status: off (0) Wifi status: off (0) BT status: off (0) 3G status: off (0) =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Touchpad status: on (1) Camera status: on (1) =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D GBMD: 0x10060020 HALS: 0x0000ca40 ``` I cycled the keyboard backlight through all states using Fn+Space (Off =E2= =86=92 Low =E2=86=92 High =E2=86=92 Off), then compared the contents of both files before and af= ter: ```text $ diff -u ~/cfg-before.txt ~/cfg-after.txt $ diff -u ~/status-before.txt ~/status-after.txt ``` Both commands produced no output. I have attached `acpidump.txt.gz`. --=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.=