From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1Qtld4-00010J-S5 for garchives@archives.gentoo.org; Wed, 17 Aug 2011 19:18:19 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 0824521C375; Wed, 17 Aug 2011 19:18:03 +0000 (UTC) Received: from mailout-de.gmx.net (mailout-de.gmx.net [213.165.64.22]) by pigeon.gentoo.org (Postfix) with SMTP id 91B7121C07E for ; Wed, 17 Aug 2011 19:17:08 +0000 (UTC) Received: (qmail invoked by alias); 17 Aug 2011 19:17:05 -0000 Received: from p5485050B.dip0.t-ipconnect.de (EHLO gmx.net) [84.133.5.11] by mail.gmx.net (mp034) with SMTP; 17 Aug 2011 21:17:05 +0200 X-Authenticated: #20088476 X-Provags-ID: V01U2FsdGVkX1+xqqMEBBCx/pP+XepOYNkaFx2ZsdvjuyyoT5JI3E lCvUETvnDYqHzX Received: by gmx.net (nbSMTP-1.00) for uid 1001 Meino.Cramer@gmx.de; Wed, 17 Aug 2011 21:17:08 +0200 (CEST) Date: Wed, 17 Aug 2011 21:17:07 +0200 From: meino.cramer@gmx.de To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] [OT]: "Reset" of USB when switching to console and back to X? Message-ID: <20110817191707.GG13752@solfire> References: <20110817030118.GA13752@solfire> <20110817184221.GE13752@solfire> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable In-Reply-To: User-Agent: mutt-ng/devel-r804 (Linux) X-Y-GMX-Trusted: 0 X-Archives-Salt: X-Archives-Hash: ed4b1df3713263d15b39de2d838dbe0a Paul Hartman [11-08-17 21:08]: > On Wed, Aug 17, 2011 at 1:42 PM, wrote: > > Paul Hartman [11-08-17 18:02]: > >> On Tue, Aug 16, 2011 at 10:01 PM, =A0 wrote: > >> > Hi, > >> > > >> > I have attached an old keyboard (PS/2-connector) via an > >> > USB-PS/2-adaptor to my PC. > >> > > >> > When typing too fast (...) the three LEDs of the keyboard flashes > >> > and everything typed then is typed as if the CTRL-Key constantly > >> > locked (I am using the X-window-system with openbox as windowmanager. > >> > There is no session management.) > >> > > >> > It is possible to revert back to normal when I switch > >> > from X-windows to the Linux console (CTRL-ALT-F1) and back > >> > to X (CTRL-ALT-F7). > >> > > >> > My question is: > >> > What part (PC? Adapator? Keyboard?) gets out of sync here is > >> > "resetted" (somehow), while switching between console and > >> > X-windows? > >> > > >> > How can I reset the behaviour without switching? How can I > >> > prevent the behaviour completly? > >> > >> FWIW I have experienced that same behavior with several PS/2 to USB > >> adapters, in Windows, in Linux, etc. I think it's a common problem > >> with those adapters in general. I've never used one that didn't "go > >> crazy" a few times a day. > >> > > Hi Paul, > > > > after some recursive investigations :) via internet I found some > > interesting things: > > 1) Yes, your are completly right: It is the USB-PS2-adapter, which > > goes crazy. > > 2) No, you are wrong, the reason is different. > > ;) :) > > 3) The answer is 41.999998 (calculated by a P90). ;) > > > > The reason for stuck CTRL/SHIFT keys is a missing pull-up > > resistor from the clock and the data line to the +5V line > > of the PS2 connection. Or in other words: Adding these resistors > > seem to fix the problem in most cases. > > See the link below (which describes the process for a IBM Model M keybo= ard. Seems true > > for other old PS2 keyboards as mine, too): > > http://ps-2.kev009.com:8081/ohlandl/keyboard/modify_keyboard/Model_M_Mo= difications.html > > > > The PS2 goes crazy because the high level gets too low without the > > additonal pull up resistors. But the "origin of the reason" is not > > the adapter, but the low high levels of the old PS2 line as such. > > > > I did find these information that late (after posting to this list) > > by searching for informations about certain different usb-PS/2-adapter. > > Sorry, when answering the other half of my own question.... :) >=20 > Very interesting info, it's good to know the real reason why it always > seems like a "universal" problem with those adapters. >=20 > In the end, to solve my own problem, I bought two Unicomp keyboards > which are the same as the old heavy IBM keyboards but with USB > built-in. ;) >=20 (my question is based only on curiosity...) Are the Unicomp Model Ms of the same quality and tactile/audible feeling as the original IBM model Ms? Best regards, mcc