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 55C3B50EBE0; Thu, 10 Sep 2026 16:44:31 +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=1789058676; cv=none; b=JSlszPqL806uJHmM+b7iMPo8ACdVy82b0Y9udMmEV/BprOn2y58XJW+RZukD9NmJzvsSsbC1X4BuQ4mU196dpM3bqW7i4kXfpuYb/GFjl7EZM/D/T5aQjNLX68DbMjpoF0+jArIYigginrNsH0MZ9YC7Um36Gu/w4sOGP6/OCcE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789058676; c=relaxed/simple; bh=eLJunRGapd+NAyYnBkmT3gtHDHbwMV6Md2sdXTELOCQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=Yz+DS938DD1GSgvaC2XUSCyXwHO6BfQ8DdzCerJEf9gsnSg9OWkszMQPF5tdF1HT9C+FblUMb32efbDUzMqIJHWOisw4AlLBmGNL0E/PbseU7jjlHxiKCW7ifB0u/kq6xbGFbbBAlQUEQlACa+B1rNVkGAAXQC8TqoOVlDrxJok= 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=EbAFa2EQ; 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="EbAFa2EQ" Received: from mail01.layka.lan (localhost [127.0.0.1]) by disroot.org (Postfix) with ESMTP id 0798780B7F; Thu, 10 Sep 2026 18:44:30 +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 smildPEo2dfE; Thu, 10 Sep 2026 18:44:29 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=disroot.org; s=mail; t=1789058669; bh=eLJunRGapd+NAyYnBkmT3gtHDHbwMV6Md2sdXTELOCQ=; h=From:To:Cc:Subject:Date; b=EbAFa2EQ0As0lFSWqW3edREH22rMQN7neUfKQG2VMsHT9IphxSxaYK5p7j1y+KmwD n/WQriWWTs0m5ddjlyqxVO/H3TDXxKWbci3Vqoc5DbQu6u3MXMe9Mci4nwGr228RPE GTwR5DZBR9T62799HDrZx3P0Vx1rGdeUoJGkV5Ylab01xqymT2nwi+2sdZu3/KXgc/ AmHSclsA+zuQeeeCWPuCDCsvDYDlaLbk4QulXsR71C1yZCOu6bxVWvCJ3Tn+vuobRX QoAziADGc7Yy9xqsoLFt0Y3Xc6EJWXzYGunZWjqZIyM+S5NUi9PLY1arWBKMkCdZCV LptIqg/dDXNXg== From: =?UTF-8?q?Rapha=C3=ABl=20Larocque?= To: linux-input@vger.kernel.org Cc: linux-kernel@vger.kernel.org, dmitry.torokhov@gmail.com, =?UTF-8?q?Rapha=C3=ABl=20Larocque?= Subject: [PATCH V2 RESEND] Input: synaptics - disable InterTouch on ThinkPad T440p (board id 2722) Date: Thu, 10 Sep 2026 12:44:25 -0400 Message-ID: <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=UTF-8 Content-Transfer-Encoding: 8bit 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 --- drivers/input/mouse/synaptics.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c index c70502e24031..8f38bc498798 100644 --- a/drivers/input/mouse/synaptics.c +++ b/drivers/input/mouse/synaptics.c @@ -1837,6 +1837,14 @@ static int synaptics_setup_intertouch(struct psmouse *psmouse, return -ENXIO; } + + /* Disable intertouch on known-broken board revisions */ + if (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