[{"id":3679290,"web_url":"http://patchwork.ozlabs.org/comment/3679290/","msgid":"<20260420083713.GA3598@black.igk.intel.com>","list_archive_url":null,"date":"2026-04-20T08:37:13","subject":"Re: [PATCH] i2c: acpi: Add ELAN0678 to\n i2c_acpi_force_100khz_device_ids","submitter":{"id":14534,"url":"http://patchwork.ozlabs.org/api/people/14534/","name":"Mika Westerberg","email":"mika.westerberg@linux.intel.com"},"content":"On Sat, Apr 18, 2026 at 07:37:19AM +0200, Niels Franke wrote:\n> The ELAN0678 touchpad (04F3:3195) found in the Lenovo ThinkPad X13\n> exhibits excessive smoothing when the I2C bus runs at 400KHz, making\n> the touchpad feel sluggish when plugged into AC power. This is the\n> same issue previously fixed for ELAN06FA.\n> \n> The device's ACPI table (Lenovo TP-R22) specifies 0x00061A80 (400KHz)\n> for the I2cSerialBusV2 descriptor. Forcing the bus to 100KHz eliminates\n> the sluggish behavior.\n> \n> Signed-off-by: Niels Franke \n\nAcked-by: Mika Westerberg ","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-i2c@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256\n header.s=Intel header.b=EMf6gNvq;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=104.64.211.4; helo=sin.lore.kernel.org;\n envelope-from=linux-i2c+bounces-17103-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com\n header.b=\"EMf6gNvq\"","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=192.198.163.19","smtp.subspace.kernel.org;\n dmarc=pass (p=none dis=none) header.from=linux.intel.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=linux.intel.com"],"Received":["from sin.lore.kernel.org (sin.lore.kernel.org [104.64.211.4])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fzf564M2Fz1yD4\n\tfor ; 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charset=utf-8","Content-Disposition":"inline","In-Reply-To":"<20260418053719.15766-1-nielsfranke@gmail.com>"}}]