From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mout.gmx.net (mout.gmx.net [212.227.17.20]) (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 0934213D51E for ; Sat, 19 Sep 2026 09:52:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=212.227.17.20 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789811550; cv=none; b=mqjlEXTm2b29KWJ2vQ+NQfP78NCdujl96oSHKet/9aGUxCPy6FCtKRjwxkYUrzRmQhCByaiB5vyDKu9kmJB6BYMYHoZyg3PZHRTt0udP7SwIIHhBYLnP0jYSAvz636M1sKaPpud4JwD/1zTYK6NX8VcUCGVyAfIAn6YoWr+00+4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789811550; c=relaxed/simple; bh=70rXZjmRA3rZicRBHOJsT7SLbRVTQ9ISPyenQLrwVls=; h=Message-ID:Subject:From:To:Date:Content-Type:MIME-Version; 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Content-Type:MIME-Version:cc:content-transfer-encoding: content-type:date:from:message-id:mime-version:reply-to:subject: to; b=qDAbPooY271ZSYXXGkpk8byYmcRH3i+u4rA5AhswhhjogKco721ND5mHV1ms6uaE 3xJM2Wu96Wb5DAdhJkNmIybRBMnWGE+8bieWjUlbMLL+JL1Z0Yl9ztEaAGCXx5Si/ WXTnblvJUbKcrIjYi6IVv+O2mUXmx75Zclb6u+BrA6chF0MUV9mleIaoASXzHSWMD VvKea7qtKFJi3ol0RAIYMTzFtMpPtVNebHysvMRVpLn2vF3fdVMhFnkP0SLieVABp uwDfVSpDduDUv/4Y2HPtVzTYjC/nGEEJBRuCJpjHII+Bdnq5CRvMfNWHDqkLgiQ14 8up9G0Rq9oEjzjF1Hw== X-UI-Sender-Class: 724b4f7f-cbec-4199-ad4e-598c01a50d3a Received: from client.hidden.invalid by mail.gmx.net (mrgmx104 [212.227.17.168]) with ESMTPSA (Nemesis) id 1MGQnF-1x0S9s38LV-009Vgo for ; Sat, 19 Sep 2026 11:52:25 +0200 Message-ID: <89f36f3f5e4c2d07b9ff72bc0b355875c336e498.camel@gmx.de> Subject: i8042: Fujitsu LIFEBOOK U7410 needs i8042.nomux (keyboard and touchpad dead) From: Heiko Brey Reply-To: heiko.brey@gmx.de To: linux-input@vger.kernel.org Date: Sat, 19 Sep 2026 11:52:19 +0200 Autocrypt: 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rEAL50DWi4JTZMB+ch8hXtPwWcBo5JPBKW8xn/Y69pBye8+8CUZAPg6SotLtUuwFEzcxE5Rjq CARQ4DSuAuH5bi1+KbynluE4Lg== --=-IT5tNuLHeXwXOQKiE7an Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi, On a Fujitsu LIFEBOOK U7410 the internal keyboard and touchpad are dead after boot with the default i8042 settings. Both work in BIOS and GRUB. The kernel registers the devices (AT Translated Set 2 keyboard, and the Elan touchpad 04F3:3092 via I2C-HID), but evtest shows no events on either. System: Kernel: 7.0.0-31-generic (Linux Mint 22.3) sys_vendor: FUJITSU CLIENT COMPUTING LIMITED product_name: LIFEBOOK U7410 board_name: FJNB2D4 BIOS: Version 2.12, 06/23/2020 With default parameters, dmesg reports: i8042: Detected active multiplexing controller, rev 1.1 atkbd serio0: Spurious ACK on isa0060/serio0 (repeated) atkbd serio0: Unknown key pressed (translated set 2, code 0x0) What I tried: - i8042.nopnp i8042.reset: no change - i8042.nomux=3D1 i8042.reset: keyboard and touchpad work, on warm and cold boot. The multiplexing message and the Spurious ACK messages no longer appear. (I have not tested i8042.nomux=3D1 without i8042.reset.) Could a DMI quirk with nomux be added for this model? Thanks, Heiko --=20 Heiko Brey GPG-Fingerprint: C8A4 ABA2 B404 407D 83F1 46FC 0A66 455F CA5A 1277 Info zu verschl=C3=BCsselten Emails: https://emailselfdefense.fsf.org/de/ --=-IT5tNuLHeXwXOQKiE7an Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEyKSrorQEQH2D8Ub8CmZFX8paEncFAmquW1MACgkQCmZFX8pa EndiVRAAo3e1h3mBKCWNIZtTLrhBt8xLekQege102Z4lbkxJt+CJhh+MnMzXbONm LaZ4UCcRj41XOiZpAbpVIV2wfiQbBUpwCbLNSVttJhs1BPX9decijD+5pvHK1Lkb vxjk7rb4aHXt4qLXughGmp4gIfyNmRHr5WKfBmruEXVU1Omvj1SqpW4KWZUdPNRF qThnb3OGmMXSEstAq65iNSyoEHuWseVJ02pZk27bxivqZOMgdX6pLQaJ77uf4x/9 h3TlR8T7zOqAhsKj66gF0Zw4+QAwDN8rb+dDbwL5l6DISrzuUhQLf8nC/ipf0idJ rkhekDg1fIfQPeUM1EZswk+8CNzeUzRWuJoqvG9hgFK82p8Ork1BqrEGI5GgkDsG QYV2jyCfBtUqbns92D/9n00KosmHl+C7nqsMUAN6xP6VfB9Q5eD2l2fPPdA8damj nbncC8Z9S9fEZEod62Ix6EvbuPGiRQioj93PxevIcK99k8PSCIihIEpQJ/tzZ2SS 3W2quM4B9EjOwJ0/ub5eqpC1j+fP7ttEoi4ei/1pysaEDRet9nGipp9aDcZsVOCU ps0ekLj7S/kv+G/zaRgMxtTdim2l4xCFoI4McpamK6lbY4j2wdlyFK6n/UbQ5R+B w/2zGQF6L/jWFw4qSkaRGXYZyJY5HELIsVkUE78ov+el7/jZOBU= =SyKp -----END PGP SIGNATURE----- --=-IT5tNuLHeXwXOQKiE7an--