linux-kernel - Re: 2.6.19-rc3: known unfixed regressions (v3)

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Date:	Mon, 30 Oct 2006 19:35:22 +0100
From:	Adrian Bunk <bunk@...sta.de>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	Jun'ichi Nomura <j-nomura@...jp.nec.com>,
	"Michael S. Tsirkin" <mst@...lanox.co.il>,
	Martin Lorenz <martin@...enz.eu.org>,
	Pavel Machek <pavel@...e.cz>, Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	len.brown@...el.com, linux-acpi@...r.kernel.org, linux-pm@...l.org,
	"Randy.Dunlap" <rdunlap@...otime.net>
Subject: Re: 2.6.19-rc3: known unfixed regressions (v3)

On Mon, Oct 30, 2006 at 10:16:34AM -0800, Linus Torvalds wrote:
>...
> I assume that "compile the kernel" just triggers some magic ACPI event 
> (probably fan-related due to heat), and I wonder if the bisection faked 
> you out because once you get "close enough" the differences are small 
> enough that the kernel compile is quick and the heat event doesn't 
> actually trigger?
> 
> See what I'm saying? Maybe the act of bisecting itself changed the 
> results, and then when you just revert the patch, you end up in the same 
> situation: you only recompile a small part (you only recompile that 
> particular file), and the problem doesn't occur, so you'd think that the 
> revert "fixed" it.
> 
> If it's heat-related, it should probably trigger by anything that does a 
> lot of CPU (and perhaps disk) accesses, not just kernel builds. It might 
> be good to try to find another test-case for it than a kernel recompile, 
> one that doesn't depend on how much changed in the kernel..

Martin's original bug report stated "now I loose ACPI events after 
suspend/resume. not every time, but roughly 3 out of 4 times."
This seems to support your theory.

But considering that two people have independently reported this as a 
2.6.19-rc regression for similar hardware (Michael for a T60 and Martin 
for an X60), a problem in the kernel seems to be involved.

Martin, Michael, can you send complete "dmesg -s 1000000" for both 
2.6.18.1 and a non-working 2.6.19-rc kernel after resume?
I don't have high hopes, but perhaps looking at the dmesg and/or 
diff'ing them might give a hint.

> 		Linus

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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