Input: i8042 - add nomux quirk for Fujitsu LIFEBOOK U7410

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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 <cico0815@gmx.de>
Link: https://lore.kernel.org/all/89f36f3f5e4c2d07b9ff72bc0b355875c336e498.camel@gmx.de/
Signed-off-by: Lovekesh Solanki <lovekeshsolanki00@gmail.com>
Link: https://patch.msgid.link/20260920113541.1484808-1-lovekeshsolanki00@gmail.com
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

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Lovekesh Solanki 2026-09-20 17:05:41 +05:30 • committed by Dmitry Torokhov

parent a961417c5a

commit 495cd7f858

1 changed files with 9 additions and 0 deletions

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drivers/input/serio/i8042-acpipnpio.h

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