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 A00D13B47FA for ; Sat, 6 Jun 2026 18:26:56 +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=1780770416; cv=none; b=mePPG3Ko7Z+tbJRGsXpPEIYfg3Ev4J/aLD6ZH0wWnv6jxIkzkG3U4YevS37GgQJrjNV1TfAAwElgK4ew87jFx310OrsDcxAcRY27wfPwHy/GhgJ3MnZZXuxt7RFddYi1WsdfaCcox0H5dN0XQI/DG7OMPmqSEt8NI3754MQYb80= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780770416; c=relaxed/simple; bh=B0vMWYeVJHbf8sTz1MJJtlyybbhytsCCrl3F0KHRvhc=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=chCTnS+4dIlKf/mRNusDeRZ9vGJ97ecki1UdQt8MqCBKsnLdKKJKy6NN27/24gSwq7bH5pep4j76u3JBEtLaIlSKudZI0ESgv5i6o+0l18GUO/T2aYlNoOudXoWh3t8hfiQW5Fl9XlObcGIyB40VMAmFdaTCcx2gBMPn4KtTo0U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=HROJeWUQ; 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="HROJeWUQ" Received: by smtp.kernel.org (Postfix) with ESMTPS id 241B6C2BCC4 for ; Sat, 6 Jun 2026 18:26:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1780770416; bh=B0vMWYeVJHbf8sTz1MJJtlyybbhytsCCrl3F0KHRvhc=; h=From:To:Subject:Date:In-Reply-To:References:From; b=HROJeWUQDL2J8rcyfRWFq6I0I01T21T/9QQZIZaVyyUejladjDFJ4Nc0i3ly447me vzSo/MMbZFrtEhmne7UpM30RamNd4L56E4iFWxUdrMxhmzOmcPhVMkRKU9dI605kSl n5lrIuOcV0Yt7jbvpiB/gb+bN0J5DrQvS4LhHQwLGJNMQKwRYYH7lEoX0ofNQbGDLA IKyyydfecKRIYTZR5Ha4b09xc2HHfhqamEkCNTgc6T0UtDES8q6zipFmplpO5rh5Gr Q9HHkYUYqmoBl2ad7cozDuv6hrfjCWc8m5gy5uMIlYjeIau8apOXgUn60MNHazlGH6 bdlw+eCzifpKA== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id F3C7CC41613; Sat, 6 Jun 2026 18:26:55 +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: Sat, 06 Jun 2026 18:26:55 +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 #32 from Rong Zhang (i@rong.moe) --- Then I doubt if clearing KBLO actually also clears 0x2A. Try: 1. Set physical keyboard brightness to Low 2. sudo busybox devmem 0xFE00D42A 8 0x05 3. sudo busybox devmem 0xFE00D48A 8 0x54 4. sudo busybox devmem 0xFE00D42A 8 5. sudo busybox devmem 0xFE00D42A 8 0x05 6. sudo busybox devmem 0xFE00D48A 8 0x55 And also try: 1. Set physical keyboard brightness to Low 2. sudo busybox devmem 0xFE00D42A 8 0x05 3. Close the lid 4. Wait several seconds 5. Reopen the lid 6. sudo busybox devmem 0xFE00D42A 8 Please also try: 1. Set physical keyboard brightness to Low 2. sudo busybox devmem 0xFE00D42A 8 0x00 3. sudo busybox devmem 0xFE00D42A 8 0x05 4. sudo busybox devmem 0xFE00D42A 8 0x04 5. sudo busybox devmem 0xFE00D42A 8 0x05 I also have a slightly dangerous idea: 1. Set physical keyboard brightness to Low 2. sudo busybox devmem 0xFE00D42A 8 0x00 3. sudo busybox devmem 0xFE00D42A 8 0xFF 4. sudo busybox devmem 0xFE00D42A 8 0x05 --=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.=