From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 77763388E55; Mon, 20 Apr 2026 08:37:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.19 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776674240; cv=none; b=bGv3D1/8NQ0ZpFsePPrVxqeOAFiQ9ayZJHdfKLnNusUoAtuLSGtg3P0wKCwcGhtrlrNu8w3Pc7YsQurBE4kwAsSass/ouZXBDrp2LgUx/BeK0uxx70P0F39vBm7E5o5Y4Ly7FbxcuHyfBilQZihtfqtdHyBcVeq9XdyUixa2eDE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776674240; c=relaxed/simple; bh=dKRuzBwG/k0FLMHeg/8aXg6fYoXyJDowLF6D6SBZJmQ=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=oQ6Fc46xck/B7X2aWnF6Bg8zd6asabKU0UEVuChpEtXwPQFROiK/TC+39ZYEGbqCDMJWs0nA+yih3aYFbPBsLMw02FpXMRc/p5aoLz8OHDlgOb8xpXD/vqt+BMYnuqBNF5DS7AEoiXKAVXDn/WYIgmFXNehWBuwHUcUE+ficXNY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=EMf6gNvq; arc=none smtp.client-ip=192.198.163.19 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="EMf6gNvq" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1776674238; x=1808210238; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=dKRuzBwG/k0FLMHeg/8aXg6fYoXyJDowLF6D6SBZJmQ=; b=EMf6gNvqOFJeZ5A5otk+d7A0xaTV1pnddvFkM3ql+HIiw8sTLexRnEOL d1lvNDJ2beJlnhYAdDtrecX/jtg8qCphK4/Uv4SFgK2hqDYxxZIpYrx6c DwstVOUf1d1DGhztuNT1cpyZo22irhJhn4ClTivXeiIZi24BY3j1z9NXr vSLGzmJDQp0X0yxS/S5WCbU5mxYdAZLJxpgVi/g3+yGgbqGR962NcWeJ7 CnvizEDgLQhLW3lddh9S2RkZbMJtioaJ8WR9jZZF9y2iFcyjEF+sTWwx0 eFsgP5iixnS2Ed4HHFVf3qceZNQwzo6+7UkidYiBiE/7hXg9rGrWo/GUw w==; X-CSE-ConnectionGUID: wWU0FFSnSfii6HO3ITE6+A== X-CSE-MsgGUID: xErdLy4oSeickvyCGtaWmg== X-IronPort-AV: E=McAfee;i="6800,10657,11762"; a="76612392" X-IronPort-AV: E=Sophos;i="6.23,189,1770624000"; d="scan'208";a="76612392" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by fmvoesa113.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Apr 2026 01:37:17 -0700 X-CSE-ConnectionGUID: lti6nJEmTbaL9SzKuAc65w== X-CSE-MsgGUID: MknTkTqaTKCvTkCqu2MZ4g== X-ExtLoop1: 1 Received: from unknown (HELO black.igk.intel.com) ([10.91.253.5]) by fmviesa003.fm.intel.com with ESMTP; 20 Apr 2026 01:37:14 -0700 Received: by black.igk.intel.com (Postfix, from userid 1001) id 4A5C195; Mon, 20 Apr 2026 10:37:13 +0200 (CEST) Date: Mon, 20 Apr 2026 10:37:13 +0200 From: Mika Westerberg To: Niels Franke Cc: westeri@kernel.org, wsa+renesas@sang-engineering.com, linux-i2c@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] i2c: acpi: Add ELAN0678 to i2c_acpi_force_100khz_device_ids Message-ID: <20260420083713.GA3598@black.igk.intel.com> References: <20260418053719.15766-1-nielsfranke@gmail.com> Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260418053719.15766-1-nielsfranke@gmail.com> On Sat, Apr 18, 2026 at 07:37:19AM +0200, Niels Franke wrote: > The ELAN0678 touchpad (04F3:3195) found in the Lenovo ThinkPad X13 > exhibits excessive smoothing when the I2C bus runs at 400KHz, making > the touchpad feel sluggish when plugged into AC power. This is the > same issue previously fixed for ELAN06FA. > > The device's ACPI table (Lenovo TP-R22) specifies 0x00061A80 (400KHz) > for the I2cSerialBusV2 descriptor. Forcing the bus to 100KHz eliminates > the sluggish behavior. > > Signed-off-by: Niels Franke Acked-by: Mika Westerberg