linux-kernel - Re: 4.10-rc1: thinkpad x60: who ate my cpu?

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Date:   Sat, 14 Jan 2017 12:30:54 +0100
From:   Pavel Machek <pavel@....cz>
To:     Woody Suwalski <terraluna977@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     kernel list <linux-kernel@...r.kernel.org>, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com
Subject: Re: 4.10-rc1: thinkpad x60: who ate my cpu?

Hi!

On Thu 2017-01-12 20:19:31, Woody Suwalski wrote:
> Pavel Machek wrote:
> >Hi!
> >
> >>I used to have two cpus, and Thinkpad X60 should have two cores, but I
> >>only see one on 4.10-rc1. This machine went through many
> >>suspend/resume cycles. When backups finish, I'll try -rc2.
> >Whoever did it, he seems to have returned the cpu in -rc3. All seems
> >to be good now.

> Actually since you have mentioned - I have checked my x60 - same problem -
> only one CPU. However I was running 4.8.13 with uptime 33 days, multiple
> sleep/wake-ups.
> Installed a current EOL 4.8.17 and rebooted - I see 2 CPUs. So the issue is
> older then 4.10 kernel, and I suspect it is the CPU hotplug / wakeup
> related...

Hmm. So I seen two cores in -rc3 after boot. But it is quite well
possible that -rc1 was ok just after boot, too, and problem happened
sometime later (probably during suspend/resume cycles). Let me go back
to -rc1 to check.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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