Re: [PATCH] Input: i8042 - add nomux quirk for Fujitsu LIFEBOOK U7410

[Dmitry Torokhov]

On Sun, Sep 20, 2026 at 05:05:41PM +0530, Lovekesh Solanki wrote:
> 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@xxxxxx>
> Link: https://lore.kernel.org/all/89f36f3f5e4c2d07b9ff72bc0b355875c336e498.camel@xxxxxx/
> Signed-off-by: Lovekesh Solanki <lovekeshsolanki00@xxxxxxxxx>

Applied, thank you.

-- 
Dmitry