Ultra CPU lags when boosts up, causing cursor stuck.

[Tyuwwe]

Device: Lenovo ThinkBook 14 G6+ IMH

CPU: Intel Ultra 7 155H

GPU: RTX4060 Laptop

Windows  11

Everytime when the CPU needs to boost up, the system will "stop", I cannot move my cursor (touchpad or mouse nor work).

But when I trying to run CPU stress tests, the CPU works fine, no lag, no stuck.

The system PL1 is 75 watts, PL2 is 115 watts.

For this problem, I have replaced 3 same devices, but all have same problem.

So I think this might be a driver problem, but no driver update in Lenovo website.

[Tyuwwe]

I unlocked my laptop's advanced BIOS, and I found that the laptop's PL4 was set to 21.7 watts (21700) --even lower than PL3!

Is this normal? I tried to set PL4 to 35 Watts. It seems to lag a lot less, but there's still a bit of lag.

Should I set PL4 higher and does it make sense for PL4 to be lower than PL3 by default?

[Mike_Intel]

Hello Tyuwwe,

Thank you for posting in Intel community Forum.

As much as we want to assist you, we are not not familiar with the their BIOS and its settings.

And also, to avoid warranty issues, it is best to contact Lenovo on the optimize settings.

It is best that the recommendations will be coming from their technical support so that the warranty of your laptop will not be void.

If you have questions, please let us know. Thank you.

Best regards,

Michael L.

Intel Customer Support Technician

[Tyuwwe]

Thank you for your reply!
I have tried to modify settings these days, adjust PL1/PL2/PL4, reinstall Windows and switch to Windows 10.
Unfortunately the system still lags when the CPU needs to boost (Although Windows 10 lags too, but it has fewer lags than Windows 11 overall).
This might not be a SEVERE problem, but It's pretty weird because in previous Intel CPUs and AMD CPUs, the cursor won't stuck when you open some software and the CPU increases its frequency and power consumption even it's a pretty heavy load.
I don't know why this happens this might be some lower level problem.
I have contacted Lenovo supports for help, I noticed I'm not the only one have the problem, but it seems that Lenovo technician can't fix this problem.

[Byron_C]

Hi Tyuwwe

I was having similar issues with my Thinkpad E14 GEN6 Intel Ultra 7 155H Laptop.

Windows performance was extremely poor and I thought it might have something to do with Windows because I dual-booted my laptop with Linux and wasn't having the same issues when working on Linux.

I fixed the problem by adjusting the power settings in Windows from "Balanced" to "Best Performance". Balanced mode must have been throttling the CPU because performance improved dramatically.

Did you get any support from Lenovo?

[Tyuwwe]

Hi Byron_C, thank you for your reply!

Unluckily I have sold my laptop because I cannot fix those user experience issues by myself.

I think there could be two reasons for the experience problem, the first possible reason is the CPU hardware design issue, and the second is the software optimisation issue.

To make a long story short, due to the complexity of the design of MTL processors (6 Performance Cores + 8 Efficient Cores + 2 Low-Power Efficient Cores), switching tasks between LPE Cores and P Cores can cause delays and stuttering. This issue may can be fixed with software scheduling, but I already sold my laptop a few months ago, so I can't test it in practice. I have seen similar problems in some communities, some people say that the problem is due to the process switching between the LPE Core and the P Core, but manually turning off the LPE Cores will cause the scheduling of other cores to be abnormal, so it is difficult to verify whether this is the reason.

But according to your description, the problems we describe may not be exactly the same, my processor's performance seems to be normal, and I can get the score I deserve in most of the benchmarks, but I think the abnormal is that my processor lags under short periods of high load (for example, open an app). The biggest problem with the experience is that the mouse freezes, the CPU, in most scenario, runs smoothly, but the frequent stuttering and lag in daily use make me feel like using I'm using a computer from ten years ago.

Before I sold my computer, I tried to ask Lenovo for help, but they couldn't reproduct the problem, which means the problem may not be common to all users, but I have returned the computer twice (that is, I have experienced three PCs of the same model) and the same problem has occurred in all three PC (Yes, all of them), which makes me a little confused.

So, after a lot of trying, I chose to sell my computer and end the bad experience

[Mike_Intel]

Hello Tyuwwe,

I hope this message finds you well. 

Were you able to check the previous post?

Please let us know if you still need assistance.

Best regards,

Michael L.

Intel Customer Support Technician

[Mike_Intel]

Hello Tyuwwe,

Thank you for the update.

It is best to further check this issue with them since they know the configuration and to further check if there is a hardware issue.

If you have questions, please let us know. Thank you.

Best regards,

Michael L.

Intel Customer Support Technician