From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from layka.disroot.org (layka.disroot.org [178.21.23.139]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E6C2337BE64; Thu, 20 Aug 2026 21:01:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=178.21.23.139 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787259665; cv=none; b=Df57h8AzjGWPwuXAqf0iZ5TOWa/Pd7xXMFm/1p3mxHJLSLZIq0wCw1KUP2dsv+ntifYa9QeS7rk3Y18DWaQfnsQJnQFXytjaD61m9KxQZkRC48V50TvCTxVIGzOCzLecEG0gHaMwQZuTE+ge/RhVuEC4ihoZeyT3U9K+fGjSCEE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787259665; c=relaxed/simple; bh=1yW4Ij4G59n+zZgbSMAfC3FRTS7pbUij1qq8AKLAI+c=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=RlFiXqLH7hyrAv4Sm+15R9TcX4una/CjIUNs3iLNQgbiboziklK/gknOuf/7P9N8wZzVstlF7+4NWvrYbfuiaH9/2uymNfrS5qTquOoycIrFRcd0zq3ow95KuIi59LDsh+rT54kSYiDbst90LKGIzz+Wf3Q4TIdlBRsxhVzGAsY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=disroot.org; spf=pass smtp.mailfrom=disroot.org; dkim=pass (2048-bit key) header.d=disroot.org header.i=@disroot.org header.b=Po+vYSwu; arc=none smtp.client-ip=178.21.23.139 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=disroot.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=disroot.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=disroot.org header.i=@disroot.org header.b="Po+vYSwu" Received: from mail01.layka.lan (localhost [127.0.0.1]) by disroot.org (Postfix) with ESMTP id 7A90687A68; Thu, 20 Aug 2026 23:01:00 +0200 (CEST) X-Virus-Scanned: SPAM Filter at disroot.org Received: from layka.disroot.org ([127.0.0.1]) by localhost (disroot.org [127.0.0.1]) (amavis, port 10024) with ESMTP id qAHr7fyi8Ypz; Thu, 20 Aug 2026 23:00:59 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=disroot.org; s=mail; t=1787259659; bh=1yW4Ij4G59n+zZgbSMAfC3FRTS7pbUij1qq8AKLAI+c=; h=From:To:Cc:Subject:Date; b=Po+vYSwu3tdNWWg7E/G8HzwiZ1yC0ZFVSnbX0Bgh3aF9/ndfQQjKcXnzrUk1QowJQ i2NAeroT0iot+IdRpVjuB6zT0xFVcueEDLmA6RjgBDc+WtrQw+Z4jf9HLYVGoGXLeo SetgIiO4qU6CgG7IOT5E15VCxo9aqFqQCV5WhZ4WP6Q7w03/3iDx9sO56gXhjIH2Op Wpm+scl3cCSLMQBwIC8uJ1i0cUz6jQ3sKZTCmaHsrdLTZaAwSroTX6MP9+HcXBo/TC BK/GQd8Njos+sg8EO3bWlzFIpj/0nVUEgtVc8W3sqxuzykk+G+oQzo3s9qcxkQvI4c VKNdYpmxYQJHA== From: "R. Larocque" To: linux-input@vger.kernel.org Cc: dmitry.torokhov@gmail.com, kees@kernel.org, rlarocque@disroot.org, linux-kernel@vger.kernel.org Subject: [PATCH] Input: synaptics - disable InterTouch on ThinkPad T440p (board id 2722) Date: Thu, 20 Aug 2026 17:00:54 -0400 Message-ID: <20260820210054.12933-1-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=UTF-8 Content-Transfer-Encoding: 8bit From: Raphaël Larocque The Lenovo ThinkPad T440p (PNP ID LEN0036, board id 2722) has a Synaptics touchpad whose SMBus companion is not ready at boot and takes ~200 s to appear. During this window the touchpad and pointer 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 PNP ID LEN0036 with 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 --- drivers/input/mouse/synaptics.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c index c70502e24031..982685918459 100644 --- a/drivers/input/mouse/synaptics.c +++ b/drivers/input/mouse/synaptics.c @@ -1837,6 +1837,16 @@ static int synaptics_setup_intertouch(struct psmouse *psmouse, return -ENXIO; } + + /* Disable intertouch on known-broken board revisions */ + if (psmouse_matches_pnp_id(psmouse, + (const char * const []){"LEN0036", NULL}) && + info->board_id == 2722) { + psmouse_info(psmouse, + "Disabling intertouch for board id %u\n", + info->board_id); + return -ENXIO; + } } psmouse_info(psmouse, "Trying to set up SMBus access\n"); -- 2.53.0