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9 Posts

02-13-2009

Salzburg, Austria

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High pitch noise on Thinkpad T400

2009-02-13, 10:29 AM

Hi,

 

I bought a Lenovo Thinkpad T400 notebook a few weeks ago. After installing Windows XP Pro I noticed a slight high pitch noise every time when Windows was started.

Now I tried it with Linux (Ubuntu 8.10) and the noise is also there.

It seems as if the noise gets louder if there is some harddrive activity. Also it gets louder if I close the display when the notebook is still on.

I also tried to change the harddisc, but with no effect.

Is there any way to solve this problem, because especially if the display is closed this noise is very nasty if it is silent around?

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58 Posts

01-06-2009

Netherlands

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Re: High pitch noise on Thinkpad T400

2009-02-13, 10:41 AM

Very probable it's your CPU.  Which do you have?

 

google / search "cpu wine"

 

I have this issue too :\

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9 Posts

02-13-2009

Salzburg, Austria

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Re: High pitch noise on Thinkpad T400

2009-02-13, 11:26 AM

I have an Intel Core 2 Duo P8400.

Is there anything I could do to solve this problem?

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4096 Posts

01-05-2008

Germany

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Re: High pitch noise on Thinkpad T400

2009-02-13, 22:21 PM
 Hello,

 

one method is to disable cpu powermanagement in bios.

 

Press F1 through start up procedure:

 

BIOS->config->power options

 

CPU powermangement-->"disable" instead of "auto"

 

A more convinient way, might be, the use of a software like RMclock. And disable the deeper sleep states C4-C6, with this program.

 

 

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151 Posts

12-19-2008

Munich, Germany

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Re: High pitch noise on Thinkpad T400

2009-02-16, 2:36 AM
Disabling those, be it in bios or rmclock, will reduce battery life and in my opinion take too much functionality off of a modern laptop cpu. I had this issue on a previous laptop and can relate to the situation. You do get used to it, but nevertheless it should not happen on a new computer. Every workaround takes functionality that has importance to the use of a laptop computer.
Thinkpad T400 (Windows 7 Ultimate x64)
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9 Posts

02-13-2009

Salzburg, Austria

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Re: High pitch noise on Thinkpad T400

2009-02-16, 9:32 AM

Hi,

 

I also thought that it will reduce battery life if I just disable the CPU power management in BIOS completely. I tried just to disable the C4 state with RMClock and it helped. This nasty noise was gone.

So how much battery life do I loose with the C4 state disabled?

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58 Posts

01-06-2009

Netherlands

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  • Message 7 of 11

Re: High pitch noise on Thinkpad T400

2009-02-17, 21:33 PM

glad to hear you somewhat fixed your problem.  unfortunatley for me disabling C4 does nothing.  both RMClock and disabling the power management option in the bios yields no change.  my squeeling is prevalent on both right and left sides, but when it's bad it's on the left.  it is audible both on AC and battery.

 

perhaps I just have really sensitive ears, but this is driving me mad!  By placing my ear to most electrical components I can sense this nasty pitch (both my modem and router).  It's just really annoying on a laptop as it's so close to you all the time.  Also, the squeeling isn't consistent so that is bothersome too.

 

Is there anything else I can try to stop this sound?  Is it just the use of poor quality components, or is complete silence on electronics just impossible?  I would almost rather have a noisy fan than muted "rough" noises than this shrieking penetrating scream.

 

if it's the motherboard I'm just really out of luck...

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9 Posts

02-13-2009

Salzburg, Austria

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  • Message 8 of 11

Re: High pitch noise on Thinkpad T400

2009-02-17, 23:03 PM

Hi, I found out that also my AC Adapter makes some noises which I thought were coming from the laptop itself. This noises are still there after disabling the C4 state but they are not so penetrating as I can move the AC adapter a bit away.

I also did a bit of research on this problem and found out that the noises come from some coils on the mainboard. If there is not enough coat on these or a bit of a production tolerance they make these sounds because of changing currents.

The only possibility to solve this problem is to put a bit of glue in and onto these coils, but if I am honest, I would not do that myself.

 

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58 Posts

01-06-2009

Netherlands

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  • Message 9 of 11

Re: High pitch noise on Thinkpad T400

2009-02-18, 17:05 PM

hi skyhawk,

 

can you link me to any more documentation regarding this?

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9 Posts

02-13-2009

Salzburg, Austria

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  • Message 10 of 11

Re: High pitch noise on Thinkpad T400

2009-02-19, 9:20 AM

Hi, there was no details documentation on how to do that on a certain laptop, just some forum entrys.

Just search on google with "CPU noise notebook" or as they call it "Penryn CPU whine" then you'll find it.

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