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SubjectRe: 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 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



"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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