From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752724Ab3BUAHW (ORCPT ); Wed, 20 Feb 2013 19:07:22 -0500 Received: from mail-pb0-f42.google.com ([209.85.160.42]:44478 "EHLO mail-pb0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752144Ab3BUAHT (ORCPT ); Wed, 20 Feb 2013 19:07:19 -0500 Date: Wed, 20 Feb 2013 16:07:49 -0800 From: Greg Kroah-Hartman To: Valdis Kletnieks Cc: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org Subject: Re: Wonky PS2-USB converter issues... Message-ID: <20130221000749.GC14395@kroah.com> References: <21767.1361400518@turing-police.cc.vt.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <21767.1361400518@turing-police.cc.vt.edu> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Feb 20, 2013 at 05:48:38PM -0500, Valdis Kletnieks wrote: > Quite some time ago, I posted about a problematic PS2-USB converter > that I used to connect an old PS2-connector keyboard to my laptop > dock, where the keyboard wouldn't be recognized at boot unless > I unplugged and reconnected it. > > Well, I've recently figured out (partly by obtaining a converter > from a different vendor) that the converters both work correctly > when plugged into a USB port that's physically on my Dell Latitude > laptop - but they have issues and require a reconnect cycle when > plugged into the docking station for the laptop. (It took a long time > to figure this out, because *of course* you plug this sort of stuff > into the docking station specifically so you don't have to plug it > in every morning). > > So obviously, it isn't the converter that is the problem, but the docking > station is doing "something stupid". Anybody have suggestions on figuring out > what it's doing wrong? PS-2 connectors can not normally handle hotplugging, the protocol doesn't allow it, and for some unlucky devices, it could actually fry the motherboard or the PS-2 device. So that's probably the issue here, the device just doesn't support it, sorry. greg k-h