From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 18 Apr 2002 20:20:15 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 18 Apr 2002 20:20:13 -0400 Received: from TYO201.gate.nec.co.jp ([202.32.8.214]:47567 "EHLO TYO201.gate.nec.co.jp") by vger.kernel.org with ESMTP id ; Thu, 18 Apr 2002 20:20:11 -0400 Message-ID: <3CBF6718.6010305@tmg99.ntes.nec.co.jp> Date: Fri, 19 Apr 2002 09:38:48 +0900 From: "Adrian V. Bono" User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.9) Gecko/20020310 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Andreas Dilger CC: linux-kernel@vger.kernel.org Subject: Re: something weird on Linux 2.4.17 on an IBM Thinkpad T20 In-Reply-To: <3CBF6225.6050605@tmg99.ntes.nec.co.jp> <20020419000928.GB28956@turbolinux.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Andreas Dilger wrote: > On Apr 19, 2002 09:17 +0900, Adrian V. Bono wrote: > >>While working in X on kernel 2.4.17 on an IBM Thinkpad T20, sometimes >>the mouse pointer would just gravitate all by itself, without my moving >>the mouse or pointing stick, upwards. The first time that happened, i >>was coding in an xterm when suddenly, window focus shifted to another >>window and i noticed the mouse pointer was moving upwards by itself. >>Anyone else notice this? > > > This is common to all thinkpads (or other laptops which have trackpoint > devices) and also happens under Windows. The cause is related to > automatic compensation for the centering of the trackpoint. Early > trackpoint devices didn't have automatic centering and I remember > replacing more than a few keyboards because the mouse would start > drifting by itself. Later trackpoints have automatic centering, but > if you hold onto the trackpoint for a long time (causing the "center" > to be offset by some amount) and then let go, it will settle back to > the "old center" and the cursor will drift for a few seconds until > the automatic centering kicks in again. > > Moral of the story - don't touch the trackpoint when you aren't doing > anything with it. > Yes, i've replied two replies similar to yours. But it happens to my desktop, too.