Question about T400s fan

Hi, I have a question for T400s owners,
Have any of you noticed a "hiccup" in the t400s fan? I can hear the fan (its not a quiet as some people say it is) and it clicks or hiccups kind of in a rhythmic pace every few seconds. I'm wondering if the fan is going bad

essaimel wrote:
Hello Samtoossi,
I have the exact same phenomenon on my brand new T400s (2808/D9G). It sound like there is some sort of strange mechanism to "respin up" the fan every few seconds : the fan speed is not constant at any time in fact, it spins a little down, then there is a little boost, and again and again.
I'm not sure this is an issue, even if I wondered at first... And now knowing I'm not alone...
Did you contact Lenovo for that ?
Thanls
No, I just use TPFanControl to keep the fan off most of the time. I'll wait until something major happens and then include this issue into the mix when I call lenovo. Im kind of hesitant to get anything in this laptop replaced right now. If its the fan that needs to replaced, its not a big deal, but If its a motherboard issue there is no way in I'm going to replace it because there are many reports by other owners of annoying processor whine, unresolved random shutdowns, and melted speakers. I'm pretty happy with the current state of my laptop, thanks to TPFanControl
FYI, this looks very similar to the infamous "pulsing fan" problem that affected many of the earlier IBM Thinkpads. Its due to ACPI polling the fan RPM every few seconds (every 6 sec for my T400s). IBM eventually released a BIOS update which fixed the problem. If you run TPFanControl, you will see that the pulsing is only noticeable under fan speed 2 which constantly changes speed. Fan speeds 1, 3,4,5,6,7 don't have this problem (speed 3 kind of has it, but its no where as annoying). It could be that this is a common problem, but most people just don't hear it because of ambient noise or they're just not bothered by it. Hopefully, a BIOS update in the future fixes this problem.
If you decide to call Lenovo and have the fan replaced, let me know how it works out

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essaimel wrote:
Hello Samtoossi,
I have the exact same phenomenon on my brand new T400s (2808/D9G). It sound like there is some sort of strange mechanism to "respin up" the fan every few seconds : the fan speed is not constant at any time in fact, it spins a little down, then there is a little boost, and again and again.
I'm not sure this is an issue, even if I wondered at first... And now knowing I'm not alone...
Did you contact Lenovo for that ?
Thanls
No, I just use TPFanControl to keep the fan off most of the time. I'll wait until something major happens and then include this issue into the mix when I call lenovo. Im kind of hesitant to get anything in this laptop replaced right now. If its the fan that needs to replaced, its not a big deal, but If its a motherboard issue there is no way in I'm going to replace it because there are many reports by other owners of annoying processor whine, unresolved random shutdowns, and melted speakers. I'm pretty happy with the current state of my laptop, thanks to TPFanControl
FYI, this looks very similar to the infamous "pulsing fan" problem that affected many of the earlier IBM Thinkpads. Its due to ACPI polling the fan RPM every few seconds (every 6 sec for my T400s). IBM eventually released a BIOS update which fixed the problem. If you run TPFanControl, you will see that the pulsing is only noticeable under fan speed 2 which constantly changes speed. Fan speeds 1, 3,4,5,6,7 don't have this problem (speed 3 kind of has it, but its no where as annoying). It could be that this is a common problem, but most people just don't hear it because of ambient noise or they're just not bothered by it. Hopefully, a BIOS update in the future fixes this problem.
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In adition, please also try to use the following powershell commands to check if the assistant has right permissions:
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[SOLVED] Question about CPU temperature

Hi everybody,
I just want to ask a question about "standard" CPU temperatures because my laptop (a Dell Vostro 3700) is permanently hot with the fans on even when I am not doing anything special.
I have CPU freq scaling active with the conservative governor, and I use Gnome Shell 3.2 with an nVidia using the nouveau driver.
Here are "stable" temperatures while writing this post:
# sensors
acpitz-virtual-0
Adapter: Virtual device
temp1: +72.5°C (crit = +103.0°C)
nouveau-pci-0100
Adapter: PCI adapter
temp1: +78.0°C (high = +100.0°C, crit = +110.0°C)
coretemp-isa-0000
Adapter: ISA adapter
Core 0: +73.0°C (high = +95.0°C, crit = +105.0°C)
Core 2: +73.0°C (high = +95.0°C, crit = +105.0°C)
And this is the output of mpstat
# mpstat -P ALL
Linux 3.1.6-1-ARCH (fm) 01/04/2012 _x86_64_ (4 CPU)
10:16:50 PM CPU %usr %nice %sys %iowait %irq %soft %steal %guest %idle
10:16:50 PM all 1.59 0.18 0.54 0.02 0.00 0.02 0.00 0.00 97.65
10:16:50 PM 0 1.88 0.15 0.72 0.02 0.00 0.01 0.00 0.00 97.22
10:16:50 PM 1 1.64 0.21 0.40 0.02 0.00 0.01 0.00 0.00 97.73
10:16:50 PM 2 1.47 0.15 0.67 0.02 0.00 0.06 0.00 0.00 97.64
10:16:50 PM 3 1.36 0.20 0.39 0.02 0.00 0.01 0.00 0.00 98.01
The fan, of course, is full speed (very annoying)
I think that these temperatures are quite high, but I don't know what's really causing all this heating because my laptop is basically idle.
Any suggestion?
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P.S.: Running Linux fm 3.1.6-1-ARCH #1 SMP PREEMPT Thu Dec 22 09:11:48 CET 2011 x86_64 Intel(R) Core(TM) i5 CPU M 430 @ 2.27GHz GenuineIntel GNU/Linux
Last edited by fm (2012-01-06 09:32:01)

samuvuo wrote:
fm wrote:Just to wrap up this topic, I "solved" the issue by adding these parameters to the kernel:
Just curious: what are the temperatures now? Sensors output after the "fix" would be nice.
It's in the previous posts:
Before (idle)
# sensors
acpitz-virtual-0
Adapter: Virtual device
temp1: +72.5°C (crit = +103.0°C)
nouveau-pci-0100
Adapter: PCI adapter
temp1: +78.0°C (high = +100.0°C, crit = +110.0°C)
coretemp-isa-0000
Adapter: ISA adapter
Core 0: +73.0°C (high = +95.0°C, crit = +105.0°C)
Core 2: +73.0°C (high = +95.0°C, crit = +105.0°C)
After (idle)
acpitz-virtual-0
Adapter: Virtual device
temp1: +63.5°C (crit = +103.0°C)
nouveau-pci-0100
Adapter: PCI adapter
temp1: +68.0°C (high = +100.0°C, crit = +110.0°C)
coretemp-isa-0000
Adapter: ISA adapter
Core 0: +62.0°C (high = +95.0°C, crit = +105.0°C)
Core 2: +64.0°C (high = +95.0°C, crit = +105.0°C)
After (after playing 8 min youtube video)
acpitz-virtual-0
Adapter: Virtual device
temp1: +74.5°C (crit = +103.0°C)
nouveau-pci-0100
Adapter: PCI adapter
temp1: +78.0°C (high = +100.0°C, crit = +110.0°C)
coretemp-isa-0000
Adapter: ISA adapter
Core 0: +73.0°C (high = +95.0°C, crit = +105.0°C)
Core 2: +75.0°C (high = +95.0°C, crit = +105.0°C)
Fan spinning is better (less noisy) after specifying the kernel parameters.
Thanks
Last edited by fm (2012-01-06 13:43:05)

Question about T400s fan

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