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 432CA33D6D5 for ; Tue, 2 Jun 2026 20:39:29 +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=1780432770; cv=none; b=Zc92rNcdBuLZ/NJfYUPKi3+bOTZ9xswbAOp58ET3SaZSimkSDXhks02BRS3USQJ1AEPvweKu9bqHp+0pXLpoj8ju4ZS5YwP9yoIE/yIQWzUDmpfSOQYgHZxUXJ6/It1/biOi13tAo6uBG0dDpsgYtHuLi/oLpZSzwjV/V9dZaYo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780432770; c=relaxed/simple; bh=107OotYueZVYoNNX48/b2QcIt1fJX/9PJyz/pkZBIjE=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=DsJOmBtpi5+I0Kb+vh1Y4+6AsRKsMItb0yUbjHu05pA5ZtMsk8ohoT9Cy+wTpkW401+WwTKCSAGoaVlwGTgNb00gRdrVxHq+JsHQwa0JPfloaTzNpDV+cOdOXdhfw3DAMDH4rXPlZq9AbA/C84L+4DqelQCb7WQg7yV/eRkXU4g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VOxv+Wxh; 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="VOxv+Wxh" Received: by smtp.kernel.org (Postfix) with ESMTPS id C816FC2BCF4 for ; Tue, 2 Jun 2026 20:39:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1780432769; bh=107OotYueZVYoNNX48/b2QcIt1fJX/9PJyz/pkZBIjE=; h=From:To:Subject:Date:In-Reply-To:References:From; b=VOxv+WxhockSZ8dC4GyxXx02ESeOwSTdRtLjKj0D3FaOhE68ldoP/REHI1DLNqqZ1 Yaa/OKbXT66nAooBnQ6m/lTnLLFG7Wv9boxEYgyMwQ6IfKnEuATcd8iS4Y4e9czp1G MKdqKx5elsc528f17Wc47pVSOrGWJh20jOhwsULpyO6Op0HSuSTuiXa9p8meAos6JQ cAYdrWnnG5q7IS/MVerQbJzZJxRCGsjfxqrxERIDjh+/U0tbSMrUDalBw3o8y5OnBH U7ArDuuL1sjcfZ52t1ofap4go1ViNQYfGZmsXNs7AyLl3f6K0bCnx9JQz/JnVD70uq SeEVUCXjA6SRw== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id A2D68C41613; Tue, 2 Jun 2026 20:39:29 +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: Tue, 02 Jun 2026 20:39:29 +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 #4 from George (george.stafilidis@proton.me) --- Hi Rong, I repeated the test while checking the debug files after each keyboard backlight state transition: * Off * Low * High The contents of both `/sys/kernel/debug/ideapad/status` and `/sys/kernel/debug/ideapad/cfg` remained identical in all three states. Relevant values remained unchanged: ```text HALS: 0x0000ca40 _CFG: 0xfe0d0018 ``` No differences were observed when cycling the keyboard backlight with Fn+Sp= ace. Please let me know if there are additional ACPI methods, traces, or debug options that would be useful to collect. --=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.=