From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Torokhov Subject: Re: [PATCH] psmouse: Expose drift duration for IBM trackpoints Date: Wed, 17 Dec 2014 15:31:58 -0800 Message-ID: <20141217233158.GB21713@dtor-ws> References: <5491B8DB.6070102@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mail-ie0-f171.google.com ([209.85.223.171]:56005 "EHLO mail-ie0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751084AbaLQXcD (ORCPT ); Wed, 17 Dec 2014 18:32:03 -0500 Received: by mail-ie0-f171.google.com with SMTP id rl12so107274iec.2 for ; Wed, 17 Dec 2014 15:32:02 -0800 (PST) Content-Disposition: inline In-Reply-To: <5491B8DB.6070102@gmail.com> Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: haarp Cc: linux-input@vger.kernel.org On Wed, Dec 17, 2014 at 06:09:47PM +0100, haarp wrote: > Hello, > > IBM Trackpoints have a feature to compensate for drift by > recalibrating themselves periodically. If for 0.5 seconds > there is no change in position, it uses this as the new zero. > > This happens often when the trackpoint is in fact being used. > This is frustrating. > > Raising the time solves the problem. > IBM's Trackpoint Engineering Specifications offer a > configuration register for this (rstdft1). It just needs to > be exposed by the driver, as others already are. > > Cheers! > -Mike > > > IBM Trackpoints have a feature to compensate for drift by recalibrating > themselves periodically. By default, if for 0.5 seconds there is no change in > position, it's used as the new zero. This duration is too low. Often, the > calibration happens when the trackpoint is in fact being used. > > IBM's Trackpoint Engineering Specifications show a configuration register that > allows changing this duration, rstdft1. > > Expose it via sysfs among the other settings. > > Signed-off-by: Mike Murdoch Applied, thank you. -- Dmitry