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

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Date:   Thu, 12 Jan 2017 20:19:31 -0500
From:   Woody Suwalski <terraluna977@...il.com>
To:     Pavel Machek <pavel@....cz>,
        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?

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.
> 								Pavel
> 								
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...

Woody