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JonathanFalk
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Posts: 8
Registered: ‎11-24-2014
Location: CA
Views: 5,512
Message 1 of 4

Thinkpad X380 Yoga - High CPU clock speed with low load & loud fan

I received my X380 Yoga with the i7-8550u a couple week back and the first thing I noticed was the fan running almost constantly. I checked task manager and noticed that even though the CPU usage is remaining low, the clock speed is running at around 3.80 GHz. 

 

My power profile is set to balanced with the minimum processor state set to 5%. If I change the maximum processor state to 99% then the clock speeds drop to below the base speed of 1.99 GHz and the fan quiets down.  The problem is the CPU will never go above 1.99 GHz when set like this, so performance is noticeably reduced.

 

I've played around in the bios and the only thing that seems to drop the idle clock speed is to turn off Intel SpeedStep which again stops the CPU from going above 1.99 GHz.

 

From my experience with my past computers the CPU should clock down when the load is low. Is this normal behaviour for this computer and processor? I am I missing a setting, or maybe a program or process is demanding full clock speed from the processor?

 

Any help or comments would be appreciated.

 

Thanks

Lenovo Staff
Lenovo Staff
Posts: 5,286
Registered: ‎10-29-2009
Location: NC
Views: 5,444
Message 2 of 4

Re: Thinkpad X380 Yoga - High CPU clock speed with low load & loud fan

Is the behavior you describe, only on AC power?

If so, take a look at this thread, and the post that is marked as the solution:  https://forums.lenovo.com/t5/ThinkPad-X-Series-Laptops/X1-Yoga-3rd-gen-CPU-frequency-pegged-at-max/t...

 

JonathanFalk
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Posts: 8
Registered: ‎11-24-2014
Location: CA
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Message 3 of 4

Re: Thinkpad X380 Yoga - High CPU clock speed with low load & loud fan

Yes, it's only when on AC power. I applied the commands you recommended in the other thread and it worked! My CPU is longer pegged at turbo frequencies  and the fan noise has been reduced.

 

Will this change affect the performance at all? I ran a Geekbench before and after and the result were similar. I'm wondering why Lenovo decided to run the CPU at max frequency when the load is low, they must have felt there was a benifit besides extra heat and fan noise.

 

The other thread was specifically for the 3rd gen X1 Yoga, I noticed in there you spoke of updates in the works to reduce the fan noise. Are there also updates in the works for X380?

 

Thanks

Lenovo Staff
Lenovo Staff
Posts: 5,286
Registered: ‎10-29-2009
Location: NC
Views: 5,396
Message 4 of 4

Re: Thinkpad X380 Yoga - High CPU clock speed with low load & loud fan

I am not sure why Lenovo decided to always run the CPU at max frequency on AC power.  I think it may have been based on some advice from Intel, but they must not have considered  the fan behavior.  I'm checking whether there will be additional updates for fan behavior with X380 Yoga like there will be for X1 Yoga.

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