Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262300AbVBBR7T (ORCPT ); Wed, 2 Feb 2005 12:59:19 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262568AbVBBR7T (ORCPT ); Wed, 2 Feb 2005 12:59:19 -0500 Received: from mx1.redhat.com ([66.187.233.31]:35799 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S262300AbVBBR7I (ORCPT ); Wed, 2 Feb 2005 12:59:08 -0500 Date: Wed, 2 Feb 2005 09:58:51 -0800 From: Pete Zaitcev To: Vojtech Pavlik Cc: Peter Osterlund , linux-kernel@vger.kernel.org, dtor_core@ameritech.net, zaitcev@redhat.com Subject: Re: Touchpad problems with 2.6.11-rc2 Message-ID: <20050202095851.27321bcf@localhost.localdomain> In-Reply-To: <20050202170727.GA2731@ucw.cz> References: <20050123190109.3d082021@localhost.localdomain> <20050201234148.4d5eac55@localhost.localdomain> <20050202102033.GA2420@ucw.cz> <20050202085628.49f809a0@localhost.localdomain> <20050202170727.GA2731@ucw.cz> Organization: Red Hat, Inc. X-Mailer: Sylpheed-Claws 0.9.12cvs126.2 (GTK+ 2.4.14; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2480 Lines: 49 On Wed, 2 Feb 2005 18:07:27 +0100, Vojtech Pavlik wrote: > On Wed, Feb 02, 2005 at 08:56:28AM -0800, Pete Zaitcev wrote: > > On Wed, 2 Feb 2005 11:20:33 +0100, Vojtech Pavlik wrote: > > > > > Well, you removed the scaling to the touchpad resolution, which will > > > cause ALPS touchpad to be significantly slower than Synaptics touchpads. > > > Similarly, the screen size used to be taken into account, but probably > > > that was a mistake, since the value is usually left at default and > > > doesn't correspond to the real screen size. > > > > Exactly. And it works much better now. > > With a Synaptics I suppose? You wouldn't like it with an ALPS. No, it's a Dualpoint, and so ALPS. But never mind that, I think I see your point. However, while I see a possibility of serious regressions with the other variety, but isn't it striking that result is so radical? With all the arithmetics still in place I can move my finger all across the pad without causing any motions. We are not talking about ballistics or any fine tuning, simply the calculations are wrong. Let me add more, too. As long as the touchpad code in mousedev.c converts absolute mode data into relative events, there's no reason to scale _to the size of the screen_. Don't you see? User needs a scaling to the sensitivity, not the screen size. I have never seen a touchpad which allowed you to cross the screen in one motion if you moved it slowly, this is why acceleration feature exists. It's completely bogus. Scaling to the size of the screen would have made sense if we used touchpad to generate absolute events, as some sort of a miniature Wacom pad. In such a case, you wouldn't be able to reach corners of the screen without scaling. But a touchpad is operated in entirely different way. If Synaptics delivers much bigger deltas for small motions, it's up to the Synapics mode of alps.c to make them reasonable, if that. There's no need to penalize ALPS. But I seriously doubt that Synaptics can be so broken. I wish Peter tested the removal of scaling with his Synaptics. If he (and Dmitry) insist on running a special code in X, that's fine. But honestly, I expect that things will go well for them. -- Pete - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/