linux-kernel - Re: Thinkpad X60 fails to boot while "hot"

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Message-ID: <20190527093938.GA12391@xo-6d-61-c0.localdomain>
Date:   Mon, 27 May 2019 11:39:38 +0200
From:   Pavel Machek <pavel@....cz>
To:     kernel list <linux-kernel@...r.kernel.org>, tglx@...utronix.de,
        bp@...e.de, hpa@...or.com, mingo@...hat.com, x86@...nel.org,
        rjw@...ysocki.net, lenb@...nel.org, linux-acpi@...r.kernel.org
Subject: Re: Thinkpad X60 fails to boot while "hot"

On Mon 2019-05-27 10:51:55, Pavel Machek wrote:
> Hi!
> 
> So if you compile a kernel, then reboot, boot will hang after "Freeing SMP
> alternatives memory" (and then wastes power, making thermal situation even worse).

Normally, next message is "smpboot: CPU0: Genuine Intel...".

I added some printks, and check_bugs() returns. Then it goes to ACPI and never
comes back...

kernel-parameters.txt points to Documentation/acpi/debug.txt, but that one does not exist.

Any ideas what debugging parameters to use for ACPI? I either get nothing or
so much that machine does not boot...

> Unfortunately, threshold for non-booting system is quite low, fan does _not_
> go full speed after reboot. Annoying for kernel development :-(. Force power off,
> wait for a while, power on, and it works again.
> 
> The bug is there for a long long time... probably 4.0 is affected, probably even
> older.

Quick test, and 4.6.0 seems to be affected.

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html