From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 625EA4F6463; Tue, 13 Oct 2026 12:36:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791895005; cv=none; b=YB9JXN8/I63FD4MK8PwxvfFpT//a+FnC4OQibQpEj9DlbAQWq1d55EBaB8nZfiHU9d4ESULkedcBp/cud13cB6ATL/sJ1nWlEbqNZ+2+oYa4UdFk7lBOS6PJLHvZfXPecY8L+OHB1Md3XvBCNvMMunOC4nTVm3wL0ylssgzc21g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791895005; c=relaxed/simple; bh=ZII+TSn9rnqe0I7ayAaOPRqkoi0XNIgPJTPhtNeuEBU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=G/DwHOXveW4ijqLcluijBepb9gnkePq/968+djpzYneMvcSu93tWDySLZ7viQwfImcolLMK6ySG2/JneDa25opqUl3HKv58QIh7hfYgUKe9rY4MNZtB4rNnQ25ec6gi1FMFAIDSFB6eqXdCmHbBbBGxzGsuxoV6O/QPDNcWpips= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=xIDSE0qr; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="xIDSE0qr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7E68F1F000FF; Tue, 13 Oct 2026 12:36:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1791895004; bh=kZMmECSdkYnYcjb0W+O0jnrGR4xuoZsfObDHu6JL7XY=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=xIDSE0qrrEPVyvT8E7f5aADe+PX+wf1Rn0/gzImAyDqI8ETNBLvFq19KX9ZAgHthf ivJxZDKvrx/3llWH3+AST3ZKmyMyw/RiQafUY1JGYoOgvYOUH/vRw7P0PZv6EB28DN Sh/BbW9OOyN9o+ezJW3lQLPUlo3HmNiI0bqJ8FHM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Heiko Brey , Lovekesh Solanki , Dmitry Torokhov Subject: [PATCH 6.12 127/497] Input: i8042 - add nomux quirk for Fujitsu LIFEBOOK U7410 Date: Tue, 13 Oct 2026 13:34:54 +0200 Message-ID: <20261013112910.905251040@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261013112907.864180619@linuxfoundation.org> References: <20261013112907.864180619@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Lovekesh Solanki commit 495cd7f858b45d2ffa9b685bba3a8c23c1ca4dd3 upstream. On the Fujitsu LIFEBOOK U7410 the internal keyboard and touchpad die shortly after boot if i8042 multiplexing controller is probed and switched to muxed mode. These multiplexing setup commands disturb the EC emulated keyboard and atkbd reports "Spurious ACK" and "Unknown key pressed" warnings, after which both keyboard and touchpad stop delivering events. Both touchpad and keyboard work in BIOS and GRUB. Disabling multiplexer using i8042.nomux=1 makes both devices work on warm/cold boot. Add a DMI quirk to force nomux mode for this model. Reported-by: Heiko Brey Link: https://lore.kernel.org/all/89f36f3f5e4c2d07b9ff72bc0b355875c336e498.camel@gmx.de/ Signed-off-by: Lovekesh Solanki Link: https://patch.msgid.link/20260920113541.1484808-1-lovekeshsolanki00@gmail.com Cc: stable@vger.kernel.org Signed-off-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- drivers/input/serio/i8042-acpipnpio.h | 9 +++++++++ 1 file changed, 9 insertions(+) --- a/drivers/input/serio/i8042-acpipnpio.h +++ b/drivers/input/serio/i8042-acpipnpio.h @@ -671,6 +671,15 @@ static const struct dmi_system_id i8042_ .driver_data = (void *)(SERIO_QUIRK_NOAUX) }, { + /* Fujitsu LIFEBOOK U7410 */ + /* Mux mode also disturbs the EC keyboard, causing spurious ACKs */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU CLIENT COMPUTING LIMITED"), + DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK U7410"), + }, + .driver_data = (void *)(SERIO_QUIRK_NOMUX) + }, + { /* Gigabyte M912 */ .matches = { DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),