[ltp] Weird CPU fan problem on T400, any help appreciated.

[Mark Altern]

Update of this issue:

I sent it in for Lenove for repair, they replace the entire
Fan-heatsink, now the issue is gone. Indeed, it is a hardware problem.
They did the repair really well.

best,

On 8/18/10, Mark Altern <mark.altern@gmail.com> wrote:
> Oh no, it is working normally for a few hours this time, but after I
> played a HD trailer from apple's site, and a minute after I turn it
> off this time, the fan kick in from 1800rmp to 2800rmp with no reason,
> this time the CPU temp is barely 41C,
>
> The Old problem come back!!! Now I really have no idea, and what
> possibly could trigger this bad behavior? Please further help is still
> needed.
>
> Don't hesitate to give me any further suggestion. Reset CMOS works for
> a few hours.
> Thanks a lot.
>
> On 8/18/10, Mark Altern <mark.altern@gmail.com> wrote:
>> I dissembled my T400, disconnected CMOS battery, and by the way, I
>> cleaned up the heatsink and reapplied thermal paste.
>>
>> Guess what, the problem disappeared. Now the fan is working normally.
>> And the CPU temp and intel graphic temp both dropped (idle) by 3-4C,
>> and now it is become pretty hard to push the CPU temp above 55C to
>> speed up the fan, I have to open two 1080HD video, and 3 flashes from
>> Youtube, and by that time the computer is stuttering and slowish, but
>> the CPU temp still refuse to go up to 53C, amazing is the new thermal
>> paste. Right after I turn off the programs, the temp drop back to 40s
>> and fan slow down.
>>
>> So cheers! Hopefully, there is no more surprises. Thanks a lot guys,
>> you guys are really a great help.
>>
>> On 8/18/10, Chris Schumann <chris@idlelion.net> wrote:
>>> Uhm, what?
>>>
>>> On 08/18/2010 01:04 PM, Mark Altern wrote:
>>>> NO, I didn't remove the BIOS battery, Let me try that and I will
>>>> report back.
>>>>
>>>
>>>> On 8/18/10, Chris Schumann <chris@idlelion.net> wrote:
>>>>> On 08/17/2010 08:15 PM, Mark Altern wrote:
>>>>>> Open a 1080 HD video with Totem in Ubuntu (Lucid), after playing it
>>>>>>
>>>>> Do you have such a video handy that we could try?
>>>>>
>>>>> (I'm running Fedora 12 on a T400, FWIW.)
>>>>>
>>>>> Chris
>>>
>>> --
>>> The linux-thinkpad mailing list home page is at:
>>> http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad
>>>
>>
>