[ltp] [T400] Tweaking temperature range for thermal sensors

[Chris Schumann]

On 6/8/12 4:31 PM, Mateusz Loskot wrote:
> On 8 June 2012 21:51, Chris Schumann<chris@idlelion.net>  wrote:
>> On 6/8/12 3:41 PM, Mateusz Loskot wrote:
>>> I'm tweaking thermal sensors control for Arch Linux on my T400.
>>> I use thinkpad_acpi module.
>>> I either set fan level manaly ACPI or use thinkfan utility.
>>> I'm wondering, what is a typical range of temperature for HDD
>>> during not HDD intensive tasks.
>>> AFAIK, temperature of 50C or higher is dangerous for HDD.
>>> Temperature range I have been observing on my laptop varies
>>> between 36C and 43C. Does it sound right?
>>>
>>> Could anyone point to any documentation regarding this?
>>>
>>> I use Seagate Momentus 750 GB 7200 rpm (ST9750420AS)
>>>
>>> p.s. I asked similar question on Thinkpad ml:
>>> http://stderr.org/pipermail/thinkpad/2012-June/036915.html
>>
>> Specs for that drive:
>> http://www.seagate.com/internal-hard-drives/laptop-hard-drives/momentus-laptop/?sku=ST9750420AS
>>
>> TL;DR: operating temp is 0 to 60C.
> Chris,
>
> Thanks for reminding me to look at the obvious document.
> It confirms the normal range, but it doesn't say anything about timing.
> For example, is constant temperature at level of 40-45C for most of
> operating time fine or too high?
>
> I'm also trying to figure out what level of fan speed should I switch
> for HDD temp<40C, what level to 40-45C, and what level>45C, etc.
>
> Best regards,
Mateusz,
With that document, Seagate is warranting that the drive will operate 
correctly at 60C indefinitely. There is no note about duty cycle, or 
about duration at temperature. To me (who is not a lawyer), they have no 
caveat. I would not change my fan based on HDD temperature until it gets 
close to 60.

FWIW, I have a T400 and run Fedora. I have never checked my HDD 
temperature or adjusted the fan thresholds.

Chris