linux-kernel - Re: 2.6.27-rc1: critical thermal shutdown on thinkpad x60

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Date:	Tue, 12 Aug 2008 13:44:27 +0200
From:	Milan Broz <mbroz@...hat.com>
To:	Pavel Machek <pavel@...e.cz>
CC:	Andi Kleen <andi@...stfloor.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	ACPI mailing list <linux-acpi@...r.kernel.org>
Subject: Re: 2.6.27-rc1: critical thermal shutdown on thinkpad x60

Pavel Machek wrote:
> Hi!
>>> On Tue, Aug 12, 2008 at 11:41:35AM +0200, Pavel Machek wrote:
>>>>>> Aug  6 11:00:10 amd kernel: ACPI: Critical trip point
>>>>>> Aug  6 11:00:10 amd kernel: Critical temperature reached (128 C),
>>>>>> shutting down.
>>>>>> Aug  6 11:00:10 amd shutdown[24414]: shutting down for system halt
>>>>>>
>>>>>> ...and machine went down at that point :-(.
>>>>> I hope you can easily reproduce it?
>>>>>
>>>>> So it's new in 2.6.27rc1 and wasn't in 2.6.26? Can you please
>>>> Yes, I'm very sure. It makes machine basically unusable.
>>> Does this mean you can easily reproduce it?  
>>> Please do a bisect then. 
>>>
>>>> Not that one :-(. Thinkpad does not even have fan device: it is
>>>> controlled by hardware.
>> Hi,
>> I see exactly the same on my x60s, but during upgrade to 2.6.26.2.
> 
> Are you sure?

yes. maybe some userspace tool controlling frequency is involved, no idea yet.
But it is 2.6.26 tree for sure.

> 
>> I found that (at least in my case) the problem is, that in
>> 2.6.25 the core frequency drop to 1GHz (instead of 1.67GHz) when
>> the temperature is above some limit.
> 
> Can you verify that 2.6.26 is okay?

No, it is not ok.
I'll run bisect again, but I hit it at least one in some 2.6.26-rc too.

> 
>> Now, the CPU cores remains on 1.67GHz and fan is unable to cool them properly
>> under heavy load (even if I set "level disengaged" through thinkpad fan control,
>> temperature sensor shows after a while 128 C (probably not real temp,
>> I expect some critical flag => and it properly switch off the
>> system...)
> 
> How do you control fans? I could not get anything but -EINVAL from IBM
> ACPI driver :-(.

you need add fan_control=1 to thinkpad_acpi module

http://www.thinkwiki.org/wiki/How_to_control_fan_speed
http://www.thinkwiki.org/wiki/ACPI_fan_control_script


>> (I had bad reproducer script in bisect and bisect failed, so I'll try it again,
>> but anyway, for me the bug is even in 2.6.26 tree. It never happened in 2.6.25.)
> 
> Hmmm... that's seriously strange. I definitely don't see it in
> 2.6.26. Maybe it is config dependend?! (Attaching my 2.6.27-rc2
> failing config.)

hm. strange, I'll try this config too...

Milan
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