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 1QtlRg-0000NK-Te for garchives@archives.gentoo.org; Wed, 17 Aug 2011 19:06:34 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id C188621C34D; Wed, 17 Aug 2011 19:06:22 +0000 (UTC) Received: from mail-vx0-f181.google.com (mail-vx0-f181.google.com [209.85.220.181]) by pigeon.gentoo.org (Postfix) with ESMTP id E6E1A21C36B for ; Wed, 17 Aug 2011 19:05:17 +0000 (UTC) Received: by vxi39 with SMTP id 39so1364296vxi.40 for ; Wed, 17 Aug 2011 12:05:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:from:date :x-google-sender-auth:message-id:subject:to:content-type :content-transfer-encoding; bh=WWv2DRZiHNrDRFGdvNZOx6KBRCjKqW/Gl14zSQmV8OI=; b=W7rLnTWGGqh+THgl14GRAsbut0OaLcphBjRQVUCQPD1MF8TAiK0OaKpTM3mnZp+LJG IF5n7WSFtlIx1FLWDkpddISjdLhrGkU8V2sqm6Of8ovMtCarkEM5FvFQBfFhPmLq8Yor NYFRgTLfhYw1U29/U6xbYxJfA9BBHJM8rUz9g= Received: by 10.52.173.101 with SMTP id bj5mr1345919vdc.387.1313607917143; Wed, 17 Aug 2011 12:05:17 -0700 (PDT) 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 Sender: paul.hartman@gmail.com Received: by 10.52.160.1 with HTTP; Wed, 17 Aug 2011 12:04:57 -0700 (PDT) In-Reply-To: <20110817184221.GE13752@solfire> References: <20110817030118.GA13752@solfire> <20110817184221.GE13752@solfire> From: Paul Hartman Date: Wed, 17 Aug 2011 14:04:57 -0500 X-Google-Sender-Auth: tZdEzM9fwpe9blrL4m-gU9uhPhI Message-ID: Subject: Re: [gentoo-user] [OT]: "Reset" of USB when switching to console and back to X? To: gentoo-user@lists.gentoo.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Archives-Salt: X-Archives-Hash: 991fb7ecb5e43b9e3b2ee83595354cc2 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 keyboar= d. Seems true > for other old PS2 keyboards as mine, too): > http://ps-2.kev009.com:8081/ohlandl/keyboard/modify_keyboard/Model_M_Modi= fications.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.... :) Very interesting info, it's good to know the real reason why it always seems like a "universal" problem with those adapters. 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. ;)