Hmmm,My T43's fan stay on High speed and it can't slow down

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Eugene · #1 Post by **Eugene** » Sat Nov 12, 2005 5:38 am

When My cpu is at 44 C the fan is turn on and working at first level. When the CPU is at 49C and the fan is at second level. But, When cpu's temp goes down 43C the fan always stay on second level
Is it a problem? Thinks!
T43-2668-4DU
AC,Adaptive, Balance all.

vpn-user · #2 Post by **vpn-user** » Sat Nov 12, 2005 6:06 am

Yes it is a problem. But none that IBM/Lenovo would fix. My T41p also has it, as well as all other T40, T41, T42, T43, R50, R51, R52 except the R50e. Unbelievable, but the cheapest model DOES NOT HAVE IT!!!

Eugene · #3 Post by **Eugene** » Sat Nov 12, 2005 10:17 am

vpn-user wrote:Yes it is a problem. But none that IBM/Lenovo would fix. My T41p also has it, as well as all other T40, T41, T42, T43, R50, R51, R52 except the R50e. Unbelievable, but the cheapest model DOES NOT HAVE IT!!!

Thinks vpn-user!
But my t42 isn't has this problem.

danny_isr · #4 Post by **danny_isr** » Sat Nov 12, 2005 10:33 am

Eugene wrote:When My cpu is at 44 C the fan is turn on and working at first level. When the CPU is at 49C and the fan is at second level. But, When cpu's temp goes down 43C the fan stay on second level.
Is it a problem? Thinks!
T43-2668-4DU
AC,Adaptive, Balance all.

try changing the power scheme when that happens, helps on mine.
doens't matter from which to which.

Eugene · #5 Post by **Eugene** » Sat Nov 12, 2005 11:02 am

dear danny
yea,i di this when the problem happens.
In my opinion the fan speed slow down should be follow cpu temp goes down.

ddutta · #6 Post by **ddutta** » Sat Nov 12, 2005 11:36 am

I dont see that on my machine and it was manufactured in mid Oct. Maybe Lenovo fixed the issue in their new embedded controller / BIOS update

Eugene · #7 Post by **Eugene** » Sat Nov 12, 2005 11:45 am

to ddutta
i hope so.

danny_isr · #8 Post by **danny_isr** » Sat Nov 12, 2005 11:46 am

Eugene wrote:dear danny
yea,i di this when the problem happens.
In my opinion the fan speed slow down should be follow cpu temp goes down.

i know it should ..... it's the fan Hysteresis , probably too wide

christopher_wolf · #9 Post by **christopher_wolf** » Sat Nov 12, 2005 1:52 pm

It is most likely what danny said; although I do think that the Temperature Control System is the one that is behind this, it does seem to be well optimized for me in most cases, but then again, it does appear to have a *very* rapid PD response. Combine that with a large settling time, and you would get similar behavior to what some people are experiencing. It could be that IBM was a tad bit over-zealous in designing the Fan to quickly change the temperature as lowering the temperature by small increments rapidly seems to be its biggest goal, its next biggest goal is keeping that trend, no matter what.

christopher_wolf · #10 Post by **christopher_wolf** » Sat Nov 12, 2005 1:53 pm

Danny has a point; although I do think that the Temperature Control System is the one that is behind this, it does seem to be well optimized for me in most cases, but then again, it does appear to have a *very* rapid PD response. Combine that with a large settling time, and you would get similar behavior to what some people are experiencing. It could be that IBM was a tad bit over-zealous in designing the Fan to quickly change the temperature as lowering the temperature by small increments rapidly seems to be its biggest goal, its next biggest goal is keeping that trend, no matter what.

pae77 · #11 Post by **pae77** » Sat Nov 12, 2005 3:10 pm

My T42p does not have the above described fan problem. Also, even when blowing pretty hard, it is not very loud.

CoolDragon · #12 Post by **CoolDragon** » Sat Nov 12, 2005 7:49 pm

Try change from balance all to maximize performance, and when the temp below 49C, re-select this scheme, it might help.

Eugene · #13 Post by **Eugene** » Sat Nov 12, 2005 9:08 pm

Thinks all! A Taiwanese tell me samething about this porblem:
When the cpu temp go down to 40 C,the fan will slow down to 2ed level
When the cpu temp go down to 38 C,the fan will stop.
And,I hope he's right.

christopher_wolf · #14 Post by **christopher_wolf** » Sat Nov 12, 2005 10:14 pm

Strange, I know that my Fan nothces down to level 1 when the Temperature gets below 52 Degrees; then the Fan spools down near 45 Degrees....

Hmmm,My T43's fan stay on High speed and it can't slow down

Hmmm,My T43's fan stay on High speed and it can't slow down

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