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 1Rp3j2-0000db-UJ for garchives@archives.gentoo.org; Sun, 22 Jan 2012 20:09:17 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id AAF85E088B; Sun, 22 Jan 2012 20:09:03 +0000 (UTC) Received: from mail-bk0-f53.google.com (mail-bk0-f53.google.com [209.85.214.53]) by pigeon.gentoo.org (Postfix) with ESMTP id AEE9DE0B2B for ; Sun, 22 Jan 2012 20:07:30 +0000 (UTC) Received: by bkbzt19 with SMTP id zt19so539303bkb.40 for ; Sun, 22 Jan 2012 12:07:29 -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=zXPkFe1F1WmFx4WXBtjiO8/LG/Os9FaaZ1v1DY6yBig=; b=bx1RZ4Q+9e0WwuvO2fGb5w3XA5OFDLPPLcaNMmtov7loA8nrG6lSJ+iNoNerPqNIho mL2/qvce47MnbTYYQ+BNGKJw+igH6Dx7rw/xcYtR8mp7AnFccoFZCMMLAtT3fH1lzIQh 4GqVF4lysUPm1R4+LSkZGaqWH1x560G9Wg/EI= 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 10.204.129.203 with SMTP id p11mr2086264bks.109.1327262849861; Sun, 22 Jan 2012 12:07:29 -0800 (PST) Received: by 10.204.177.18 with HTTP; Sun, 22 Jan 2012 12:07:29 -0800 (PST) In-Reply-To: References: <4F1C504D.6010105@gmail.com> Date: Sun, 22 Jan 2012 15:07:29 -0500 Message-ID: Subject: Re: [gentoo-user] KVM problems - anyone know _why_ it happens? From: Michael Mol To: gentoo-user@lists.gentoo.org Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Archives-Salt: b2e4f44a-48aa-41a4-9766-854702b09f0c X-Archives-Hash: f344d08cb3ca030e0bb35312d60ff84c On Sun, Jan 22, 2012 at 2:30 PM, Mark Knecht wrote: > On Sun, Jan 22, 2012 at 10:58 AM, Michael Mol wrote: >> On Sun, Jan 22, 2012 at 1:07 PM, G.Wolfe Woodbury w= rote: >>> 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 wonderi= ng 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 f= rom >>> the monitor. =C2=A0I suspect that this is from old design specs that ha= ve 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 differe= nt >>> (necessarily) from the MSFT drivers to not reliably sense the EDID retu= rn >>> 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. If you're not using Xinerama, you can specify screens by changing $DISPLAY. e.g. :0.0 is screen 0, :0.1 is screen 1, :0.2 is screen 2... --=20 :wq