From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: Lovekesh Solanki <lovekeshsolanki00@gmail.com>
Cc: linux-input@vger.kernel.org, Heiko Brey <cico0815@gmx.de>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Input: i8042 - add nomux quirk for Fujitsu LIFEBOOK U7410
Date: Sun, 20 Sep 2026 19:54:45 -0700 [thread overview]
Message-ID: <arCccVxkp16QbAs2@google.com> (raw)
In-Reply-To: <20260920113541.1484808-1-lovekeshsolanki00@gmail.com>
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@gmx.de>
> Link: https://lore.kernel.org/all/89f36f3f5e4c2d07b9ff72bc0b355875c336e498.camel@gmx.de/
> Signed-off-by: Lovekesh Solanki <lovekeshsolanki00@gmail.com>
Applied, thank you.
--
Dmitry
prev parent reply other threads:[~2026-09-21 2:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-20 11:35 [PATCH] Input: i8042 - add nomux quirk for Fujitsu LIFEBOOK U7410 Lovekesh Solanki
2026-09-21 2:54 ` Dmitry Torokhov [this message]
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