From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.17]) (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 89E7B3F1AC0; Mon, 24 Aug 2026 10:22:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.17 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787566945; cv=none; b=MjrPu7WJkdxUwiFcno/J8ffp6dsYXRyTjUiziduR5LQMNxrq9zBjkAivAIEztGPv/HH14KKu/D8a3rwpTl0Tg6UBm6l+u/8XHc47mBw6exIDv+b4/6BKonexf/czsnRvKa4imf2byxhTG/nz+cEHr6R6efYLDCM+K74EtIDDgPg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787566945; c=relaxed/simple; bh=8itdofsOPXidm6gqt1/415I4d7Zc2iJyah7th4xASXQ=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=qI1nY0Wbo2YLPOzhH2Z9u0YGMYyP7PC6YLCnpolhJHN7S2KAsNUkQFzNoZ3lmRQdwFZwSLnij4rtn+98RA/dgyFFDSwoxy/Ecqpm4mUE3iOalMi0rU91yZ+7EMS5YLjhTLL4i/EAxNfMZ7ZyNMYazOW/uGOrFY9jmUohH73DTbM= 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=kel3UoUo; arc=none smtp.client-ip=192.198.163.17 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="kel3UoUo" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1787566944; x=1819102944; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=8itdofsOPXidm6gqt1/415I4d7Zc2iJyah7th4xASXQ=; b=kel3UoUowzIFkOkcSl7oWWF5ZaPqKJuNDhvaaSbFQMhpDkXofdicZi+2 PEjFUyyPxnv5vbYUZE2Oiq8A5r27I/zikUK6xq7S5pGbI3pEQqVIXHk3q EIY1xZC2fy19TMtPKPjqNBOPVKBRPwnlW9W73K3WbWJa7v0EaTN0WgGgl GTavPl4Gs+fqThUHyfT9xb72B5IdFGSgKadbmtzFjOs9nL1WVnihqjHGD OyX+0syyxA6kxQkSo802Q0c38Athh5NuWt05qaGlOz8kPW/jyC6ibbd6W 8m7EDsXt0IX8wsMiqaZ6faNitPBZevBHp2FNOoa8R85TIwE/7ao9bACRR Q==; X-CSE-ConnectionGUID: 91WfhQqSSeWX/Ayug0ObAg== X-CSE-MsgGUID: o9HbzdPMQd6gzw6dZFJigQ== X-IronPort-AV: E=McAfee;i="6800,10657,11884"; a="87884856" X-IronPort-AV: E=Sophos;i="6.25,240,1779174000"; d="scan'208";a="87884856" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by fmvoesa111.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Aug 2026 03:22:24 -0700 X-CSE-ConnectionGUID: qUycJmyYTguHutobk/2J/g== X-CSE-MsgGUID: aRJkUt2SQ0es38nF6GgHJw== X-ExtLoop1: 1 Received: from black.igk.intel.com ([10.91.253.5]) by fmviesa003.fm.intel.com with ESMTP; 24 Aug 2026 03:22:22 -0700 Received: by black.igk.intel.com (Postfix, from userid 1001) id A1D2499; Mon, 24 Aug 2026 12:22:21 +0200 (CEST) Date: Mon, 24 Aug 2026 12:22:21 +0200 From: Mika Westerberg To: xiaoyueyoqwq Cc: andi.shyti@kernel.org, westeri@kernel.org, linux-i2c@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, Andy Shevchenko Subject: Re: [PATCH v2] i2c: acpi: Add DELL0A86 to i2c_acpi_force_100khz_device_ids Message-ID: <20260824102221.GE893316@black.igk.intel.com> References: <63cb7f6e-27ab-43d8-adb5-d2f4acd57674@gmail.com> <20260823123310.188189-1-xiaoyueyoqwq@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=utf-8 Content-Disposition: inline In-Reply-To: <20260823123310.188189-1-xiaoyueyoqwq@gmail.com> +Andy On Sun, Aug 23, 2026 at 08:33:10PM +0800, xiaoyueyoqwq wrote: > The ELAN 04F3:3185 touchpad exposed as DELL0A86 on the Dell Inspiron > 13 5310 intermittently exhibits excessive smoothing when the I2C bus > runs at 400 kHz. During an affected period pointer movement becomes > severely sluggish and sticky for tens of seconds. > > The ACPI firmware configures the touchpad bus for 400 kHz. Add DELL0A86 > to i2c_acpi_force_100khz_device_ids so that the bus runs at 100 kHz, as > is already done for other touchpads exhibiting the same excessive > smoothing problem. > > With the quirk applied, the kernel reports that the firmware requested > 400 kHz and that the bus is forced to 100 kHz. The problem did not recur > during extended heavy use, including an S4 hibernate/resume cycle. > > Assisted-by: Codex:ChatGPT-5.6-Sol > Assisted-by: OpenCode:Ox Alpha (x-preview-f-free) > Signed-off-by: xiaoyueyoqwq You should use your full name here. Anyway looks good to me. Acked-by: Mika Westerberg > --- > Changes in v2: > - Resend as non-flowed plain text; Thunderbird mangled whitespace in v1. > - No code changes. > > drivers/i2c/i2c-core-acpi.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c > index 8f3bdd5..3af0e05 100644 > --- a/drivers/i2c/i2c-core-acpi.c > +++ b/drivers/i2c/i2c-core-acpi.c > @@ -371,6 +371,7 @@ static const struct acpi_device_id i2c_acpi_force_100khz_device_ids[] = { > * the device works without issues on Windows at what is expected to be > * a 400KHz frequency. The root cause of the issue is not known. > */ > + { "DELL0A86", 0 }, > { "DLL0945", 0 }, > { "ELAN0678", 0 }, > { "ELAN06FA", 0 }, > -- > 2.53.0