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Sun, 20 Sep 2026 19:54:48 -0700 (PDT) Date: Sun, 20 Sep 2026 19:54:45 -0700 From: Dmitry Torokhov To: Lovekesh Solanki Cc: linux-input@vger.kernel.org, Heiko Brey , linux-kernel@vger.kernel.org Subject: Re: [PATCH] Input: i8042 - add nomux quirk for Fujitsu LIFEBOOK U7410 Message-ID: References: <20260920113541.1484808-1-lovekeshsolanki00@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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 > Link: https://lore.kernel.org/all/89f36f3f5e4c2d07b9ff72bc0b355875c336e498.camel@gmx.de/ > Signed-off-by: Lovekesh Solanki Applied, thank you. -- Dmitry