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 1Rp39d-0001d7-QS for garchives@archives.gentoo.org; Sun, 22 Jan 2012 19:32:42 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id BE4D4E09FF; Sun, 22 Jan 2012 19:32:18 +0000 (UTC) Received: from mail-wi0-f181.google.com (mail-wi0-f181.google.com [209.85.212.181]) by pigeon.gentoo.org (Postfix) with ESMTP id 05EBEE0918 for ; Sun, 22 Jan 2012 19:30:36 +0000 (UTC) Received: by wibhi8 with SMTP id hi8so120293wib.40 for ; Sun, 22 Jan 2012 11:30:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; bh=QZhBClNup3W8Aeb7LWT3NRL/jKhyikMFJ6VV+tKa1S4=; b=mJkSO9AziiDPXlqpP4SF+i9E/6mwLGqZOqTqsDyxXYIWvsKEwXSABzonegZAL9lC95 Nlgw4g5akO62hrw4jLnweL8SUkEyFUkNHR5WLdTkVerGidNNQYe8jPVRMY6DtakUHil3 WzmgJUXD1ZpJvtDPLNmJ8mteL8PHhpLhyH6WM= 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 Received: by 10.180.19.97 with SMTP id d1mr8905228wie.12.1327260636178; Sun, 22 Jan 2012 11:30:36 -0800 (PST) Received: by 10.223.160.73 with HTTP; Sun, 22 Jan 2012 11:30:36 -0800 (PST) In-Reply-To: References: <4F1C504D.6010105@gmail.com> Date: Sun, 22 Jan 2012 11:30:36 -0800 Message-ID: Subject: Re: [gentoo-user] KVM problems - anyone know _why_ it happens? From: Mark Knecht To: gentoo-user@lists.gentoo.org Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Archives-Salt: c5b41ed3-6f3d-45b0-b633-44b0180844c5 X-Archives-Hash: e863350c98f8e8bb7c843b95702fd336 On Sun, Jan 22, 2012 at 10:58 AM, Michael Mol wrote: > On Sun, Jan 22, 2012 at 1:07 PM, G.Wolfe Woodbury wr= ote: >> On 01/22/2012 12:42 PM, Mark Knecht wrote: >>> >>> I played a bit with get-edid | parse-edid. Logically that stuff even >>> working says the VGA monitor cable is bidirectional. I started wonderin= g if >>> the KVM messes up the data coming back, or what else might be going on. >>> Thanks for the ideas, Mark >> >> Many of the cheap KVM models do, indeed, mess up the EDID data coming fr= om >> the monitor. =C2=A0I suspect that this is from old design specs that hav= e too >> much pull-up/pull-down on the EDID lead since the boxen haven been >> re-engineered for newer, higher resolution and higher speed monitors. >> >> I have had problems specifically with the BELKIN KVMs. >> >> It may also be that the video drivers for Linux are just enough differen= t >> (necessarily) from the MSFT drivers to not reliably sense the EDID retur= n >> signals. > > Concur. It sounds like the EDID block isn't making it back or is > somehow messed up. x11-misc/read-edid would help in investigating that > kind of issue. > Yeah, I did that sort of stuff already. It didn't tell me anything specific as best I could tell. However I haven't done it with the KVM out. Maybe comparing the two responses would give some clues. Also, thanks for the pointer to xvidtune. Interesting little app. QUESTION: Do you know how to get the data for each monitor/video card combo? So far I haven't figured out how to tell it Screen2. Seems to only give me Screen0 as best I can tell. I'm a bit nervous to just start trying things. Cheers, Mark