linux-kernel - Re: Suspend/Resume/Hibernation

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Message-Id: <20071116180006.0029C87EE9C@smtp06.mtu.ru>
Date:	Fri, 16 Nov 2007 21:00:02 +0300
From:	Andrey Borzenkov <arvidjaar@...l.ru>
To:	Kristoffer Ericson <kristoffer.ericson@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Suspend/Resume/Hibernation - bisecting or bug-logs?

Kristoffer Ericson wrote:

> Greetings,
> 
> Ive been following your discussion and documentation efforts concerning pm
> in the kernel. This has in the past been a gray area which was hard to
> find information about so kudos.
> 
> I maintain 2 handheld platforms that would benefit greatly from
> implementing proper pm (mainly suspend) but Im having problems bugtracking
> it. Currently the system tries to suspend but fails somewhere and then
> tries to resume (which fails). The end result however is that Im unable to
> see anything (bugmessages...) since the video driver gets deactivated by
> pm.
> 
> My question is this: Is bisecting (turning off device support in kernel
> until it works) the best approach when bugtracking pm suspend? Or is there
> any other logging system that I can use?
> 

Good question. I could use advice too :)

Bisecting is good only if you have known good and known bad versions. From
your description it sounds like it has never worked - so bisecting won't
help. Also sometimes bisecting hits way too large commit (this happened to
me when ACPI replaced mutex with spinlock).

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