From mboxrd@z Thu Jan 1 00:00:00 1970 From: Miles Fidelman Subject: Re: How can I diagnose a startup failure on a live USB? Date: Sat, 9 Sep 2017 13:02:33 -0700 Message-ID: References: <1504875804.3275.1.camel@gmail.com> <20170909195028.GA2455@macbook42.flashner.co.il> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable Return-path: Received: from eggs.gnu.org ([2001:4830:134:3::10]:37910) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dqlxf-0002nY-N2 for help-guix@gnu.org; Sat, 09 Sep 2017 16:02:40 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dqlxc-00074n-LT for help-guix@gnu.org; Sat, 09 Sep 2017 16:02:39 -0400 Received: from server1.neighborhoods.net ([207.154.13.48]:37198) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dqlxc-00074V-IC for help-guix@gnu.org; Sat, 09 Sep 2017 16:02:36 -0400 Received: from localhost (localhost.localdomain [127.0.0.1]) by server1.neighborhoods.net (Postfix) with ESMTP id EEC52CC48C for ; Sat, 9 Sep 2017 16:02:35 -0400 (EDT) Received: from server1.neighborhoods.net ([127.0.0.1]) by localhost (server1.neighborhoods.net [127.0.0.1]) (amavisd-new, port 10024) with LMTP id X7+OoDp+F4tu for ; Sat, 9 Sep 2017 16:02:35 -0400 (EDT) Received: from Miless-MacBook-Pro.local (174-17-136-78.phnx.qwest.net [174.17.136.78]) by server1.neighborhoods.net (Postfix) with ESMTPSA id BB026CC439 for ; Sat, 9 Sep 2017 16:02:34 -0400 (EDT) In-Reply-To: <20170909195028.GA2455@macbook42.flashner.co.il> Content-Language: en-US List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-guix-bounces+gcggh-help-guix=m.gmane.org@gnu.org Sender: "Help-Guix" To: help-guix@gnu.org On 9/9/17 12:50 PM, Efraim Flashner wrote: > On Fri, Sep 08, 2017 at 03:03:24PM +0200, David Seaward wrote: >> Hi all, >> >> I am trying to run Guix SD from a live USB on two machines. On machine >> A this works: I can select "linux-libre" from GRUB and the startup >> process runs, ending with a prompt on TTY 1 and documentation on TTY 2= . >> >> On machine B, the startup process runs but towards the end (ssh- >> keygen... ncsd...) the screen goes black and I can't switch between >> TTYs. >> >> How can I diagnose the cause of this problem? Even enough to report an >> error message. >> >> Perhaps see if there's a way to set more verbose logging with a boot=20 parameter, and find a way to capture the console messages (e.g., use a=20 serial console, and a software TTY emulator).=C2=A0 That will at least te= ll=20 you where things stop working.=C2=A0 You can start debugging from there. A cruder approach:=C2=A0 On the system that works, record the sequence of= =20 steps that occur "towards the end."=C2=A0 Then work through the configura= tion=20 of each of those steps, in turn, for the machine that doesn't work.=C2=A0= =20 (Hunch:=C2=A0 There's a subtle mismatch between configuration and the=20 underlying hardware.) Miles Fidelman --=20 In theory, there is no difference between theory and practice. In practice, there is. .... Yogi Berra