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Re: How can I diagnose a startup failure on a live USB?

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
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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

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 parameter, and find a way to capture the console messages (e.g., use a serial console, and a software TTY emulator).  That will at least tell you where things stop working.  You can start debugging from there.

A cruder approach:  On the system that works, record the sequence of steps that occur "towards the end."  Then work through the configuration of each of those steps, in turn, for the machine that doesn't work.  (Hunch:  There's a subtle mismatch between configuration and the underlying hardware.)

Miles Fidelman

In theory, there is no difference between theory and practice.
In practice, there is.  .... Yogi Berra

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