linux-kernel - how to debug a kernel that does not power off?

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Message-ID: <4BA9525E.9000701@maroy.hu>
Date:	Tue, 23 Mar 2010 17:44:30 -0600
From:	Ákos Maróy <akos@...oy.hu>
To:	Kernel development list <linux-kernel@...r.kernel.org>
Subject: how to debug a kernel that does not power off?

Hi,

This might be a lame question, but: how would I debug a kernel that
simply does not power off a machine? When powering off, on the console I
get to the message: [...] Poweroff.

but then, the machine actually does not power off. This is an HP Envy 15
laptop using an intel i7 CPU, and kernel 2.6.32.9.

I tried to read up on all sorts of documentation, but could not get more
debug info out of the kernel :(

any pointers would be welcome..

Akos
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