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Sun, 13 Sep 2026 16:15:30 -0700 (PDT) Received: from google.com ([2a00:79e0:2ebe:8:a739:376c:7eb4:ea2d]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-33bc03778c7sm11934175eec.9.2026.09.13.16.15.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 13 Sep 2026 16:15:29 -0700 (PDT) Date: Sun, 13 Sep 2026 16:15:26 -0700 From: Dmitry Torokhov To: =?utf-8?Q?Rapha=C3=ABl?= Larocque Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH V2 RESEND] Input: synaptics - disable InterTouch on ThinkPad T440p (board id 2722) Message-ID: References: <20260910164425.12832-1-rlarocque@disroot.org> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260910164425.12832-1-rlarocque@disroot.org> On Thu, Sep 10, 2026 at 12:44:25PM -0400, Raphaël Larocque wrote: > The Lenovo ThinkPad T440p (PNP ID LEN0036, board id 2722) has a > Synaptics touchpad whose SMBus companion is not ready at boot and > takes roughly 200 seconds to appear. During this window the touchpad > and TrackPoint are completely unresponsive on approximately 50% of > boots, making the machine unusable until the companion finally > registers. > > The device is in the topbuttonpad_pnp_ids[] SMBus allowlist, so the > kernel attempts to use SMBus/RMI4 mode by default. When the companion > is not ready, psmouse_smbus_init() leaves breadcrumbs and returns > -EAGAIN, the PS/2 fallback path is taken, but the device does not > function properly until the companion appears and RMI4 takes over. > > Disable SMBus InterTouch for board id 2722 so the touchpad and > TrackPoint work immediately via PS/2 from boot. Users can still force > SMBus with psmouse.synaptics_intertouch=1 if needed. > > Tested-by: Raphaël Larocque > Signed-off-by: Raphaël Larocque Applied, thank you. -- Dmitry