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 4C4632D8378 for ; Sun, 7 Jun 2026 10:49:13 +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=1780829353; cv=none; b=JKE2vP3z2GuwGYYOuiARqt4DauM8KvT7cctNOFIdGy1M+0sKrEHdsPCEm48I/ofZFn+kkkNWPB5HlZzxJc6FsyftPe+zyffTcFkFgCdNws7iZ+Tsh7OL9r4+SF9PHagnXNyCYm9qAgSJe6by8Ms/HixbkGNetGVoBjERKGyN+WI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780829353; c=relaxed/simple; bh=GdtW9XuuNg8ZFt4Qse4x7GLrHpHsLQivyZdeSl1Jpb8=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=Kw9SexPtSsLDE8PeRpQy9EGMoxzHGNAj8K0hNSM5gznwUkXfDEKZ86BNqMJOoL6B9YXzmihquAMeaJ7gT8qao4aNtu/WapUf8cvjdiv8D6vYAzsVRCWtpzR/F3gNMYDq9iByHQl4V1GNDXh34oXoZXl6LHt0OSZuPpZHcZF7aOo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AR+V3E+T; 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="AR+V3E+T" Received: by smtp.kernel.org (Postfix) with ESMTPS id EF6D0C2BCB4 for ; Sun, 7 Jun 2026 10:49:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1780829353; bh=GdtW9XuuNg8ZFt4Qse4x7GLrHpHsLQivyZdeSl1Jpb8=; h=From:To:Subject:Date:In-Reply-To:References:From; b=AR+V3E+TBtyUHJjVTIk2gUJvZBqYqPHQnIGyfFwo4FNjS1aRCxMOViNG9y8OaJOi5 NMaRx/Qywll+iwNSiCg/tbonYXUOyT7Zts2aIOOiEFnmeL/8B0Lg9Df2W7kCUG2lzN QgtIXuKf5xgExYjrkBhDnZJ8k1159BADqHJ7W/n+ttscmzVtyg6NRRQINBgljieXrQ LRZEQkG/8Fa2TTvKzT7kL7RUXQiHNQNqUycXp4rsN89dwrY01t7vRhcFP9Y1jnljah LmD1BJbGzbKAzumJZXCkzbzUpZP+5gTO+T464CwLcViqFsNQPIlRFGfVymR8D9ljKL JfQLTM5rTmcTQ== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id D0F3EC3279F; Sun, 7 Jun 2026 10:49:12 +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: Sun, 07 Jun 2026 10:49:12 +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: i@rong.moe 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 #39 from Rong Zhang (i@rong.moe) --- Hi George, That's expected. As I've said, "this DSDT patch should allow you to switch between Off and Low using software", and "software *will not prevent* you f= rom switching to High anyway, but the hardware brightness will be Low." The LED core of Linux does not allow different set and get capabilities. To have a fully functional OSD, we must provide all three states with the side effect of ineffective High when using software control. I believe it's the = best result we can achieve. Just ignore the High button :) --=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.=