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 00F422EEE9F for ; Mon, 27 Jul 2026 15:40:24 +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=1785166825; cv=none; b=NTN3+BrE+9bkz9TgWQ9tGayRb6T9d/PvhRCmIbbf31wzVlskW3TgpG24HxLilUzR6vGbsvWAnnzQgW7pjnOTORmLkPF4e5V2J+jF7jZHCy3OcpAdPY/mt8pf63p9cv7Iohokg7XzlK8e9wA8+Y0wdBYQOLYwtCy3k3C9x9iX1MU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785166825; c=relaxed/simple; bh=NZau28087hQh0ag26LhBGCa5yW+B8puMTMp7jVd8cpQ=; h=From:To:Subject:Date:Message-ID:Content-Type:MIME-Version; b=ewqelW5fOHDTXtXe5GHOBsvLAwSFmjpNIQsC+ZVkWcElb7jU4BDeWwZ5KPx04n3xGeNqmnWiD/spsfjjX50XiZt66A1CWbanr3WwngFK/89HTvxrI+yOm+ueY3VeDjkUFK6cHRi4qYfbD19eNcsFpfKAio208mKBkW0B0SKms+Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=rj87iWWX; 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="rj87iWWX" Received: by smtp.kernel.org (Postfix) with ESMTPS id 77D7BC19425 for ; Mon, 27 Jul 2026 15:40:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1785166824; bh=NZau28087hQh0ag26LhBGCa5yW+B8puMTMp7jVd8cpQ=; h=From:To:Subject:Date:From; b=rj87iWWXnrgnlVpGJyN0VIHFsCVAyyedorKnbo4DNqbKT/hTbe8/MH3+FIll2Atk1 fAIzg7yhVwQoVwxtAom45rPeSZ+dPxo/veNLTtwtAey8LU+NxJ4KCpxNuTFpXCe9CY 0IfbH7iUMNCWyy3yzId59vSbM+KFMCS9KmI+TzCACQwsZcDslLt/H+/3utf5cHuuo7 nnzYFd+bOclthc+ytas2pVaAWTTVxU4xAzzxidq655SRJNrwc3btdHH9RaHAbP6xwA UhzPyEsJ9fGmEvmGsnNVLIQD4w48zTsFBoXLSTFvIOzDrnzqlpcETl0rSKZRVjvCnd vdEckFjPgAlEw== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 522D5C433E1; Mon, 27 Jul 2026 15:40:24 +0000 (UTC) From: bugzilla-daemon@kernel.org To: platform-driver-x86@vger.kernel.org Subject: [Bug 221800] New: HP ProBook 445 G9: keyboard backlight hotkey no longer works after upgrade to Linux 7.1.4 Date: Mon, 27 Jul 2026 15:40:24 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: new 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: bread708kms@gmail.com 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: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter cf_regression attachments.created Message-ID: 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=3D221800 Bug ID: 221800 Summary: HP ProBook 445 G9: keyboard backlight hotkey no longer works after upgrade to Linux 7.1.4 Product: Drivers Version: 2.5 Hardware: AMD OS: Linux Status: NEW Severity: normal Priority: P3 Component: Platform_x86 Assignee: drivers_platform_x86@kernel-bugs.osdl.org Reporter: bread708kms@gmail.com Regression: No Created attachment 310526 --> https://bugzilla.kernel.org/attachment.cgi?id=3D310526&action=3Dedit Diagnostic logs from the working kernel (Linux 7.1.3-arch1-2), including dm= esg, kernel journal, input device information, hardware information, evtest outp= ut, and system configuration for comparison w Overview After upgrading from Linux 7.1.3-arch1-2 to Linux 7.1.4-arch1-1, the keyboa= rd backlight hotkey on my HP ProBook 445 G9 stopped working. This is a regression, as downgrading only the Linux kernel back to 7.1.3-arch1-2 immediately restores the functionality. No BIOS changes or userspace changes were made between the working and brok= en tests. Steps to Reproduce Boot Linux 7.1.4-arch1-1 on an HP ProBook 445 G9. Log into the system. Press the keyboard backlight hotkey. Optionally monitor /dev/input/event4 using evtest while pressing the key. Actual Results The keyboard backlight does not toggle. evtest reports only the following when the key is pressed: Event: type 4 (EV_MSC), code 4 (MSC_SCAN), value 43 No corresponding EV_KEY event is generated. Other function keys (brightness, volume, etc.) continue to function normall= y. The keyboard backlight hardware itself is functional, as it turns on after a cold boot. Expected Results Pressing the keyboard backlight hotkey should generate the appropriate key event and toggle the keyboard backlight, as it does on Linux 7.1.3-arch1-2. Regression Information Working kernel Linux 7.1.3-arch1-2 Broken kernel Linux 7.1.4-arch1-1 The issue is completely reproducible. Downgrading only the kernel from 7.1.4 to 7.1.3 restores the keyboard backl= ight hotkey functionality immediately. Hardware Laptop: HP ProBook 445 G9 BIOS Version: U88 Ver. 01.22.01 BIOS Date: 2026-05-04 Distribution: Arch Linux Additional Information The hp_wmi driver is loaded. dmesg contains: hp_wmi: query 0x4 returned error 0x5 The system does not expose a keyboard backlight LED interface under /sys/class/leds. /proc/bus/input/devices identifies the internal keyboard as AT Translated S= et 2 keyboard and the HP WMI device as HP WMI hotkeys. If additional logs or testing are required, I would be happy to provide the= m. --=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.=