CPU drops to 1.80GHz even just browsing and do typing

[jmambu]

Hi there, this laptop has been good for the past year. One day I noticed something's strange with the performance.
It seems the CPU speed drops to 1.80 and stuck there when I do multitaskings light things let alone playing games.

Any idea how to fix it? Thanks!

I have attached IPDT, SSU, XTU screenshot, benchmark and a video of XTU (plugged in and not plugged in) and some other things incase needed

XTU video also can be accessed here: https://ttprivatenew.s3.amazonaws.com/pulse/jyym27/attachments/14233112/TinyTake29-07-2020-01-20-54.mp4

spec:
Lenovo Yoga 520-14IKB 

Display : 14" FHD (1920 x 1080) IPS touchscreen
Processor : Intel® Core™ i7-8550U
Memory : 8 GB Dual Channel ( 4 GB On Board )
Hard Drive : 1 TB + 128GB
Graphics :NVIDIA GeForce MX130 (2GB GDDR5)
Operating System : Windows 10 Home

[AlHill]

You have a U processor.  XTU only supports X and K processors.

You should uninstall XTU and reset the bios to defaults.

And, if you are undervolting, that is a bad thing:

https://securityboulevard.com/2019/12/plundervolt-a-new-intel-processor-undervolting-vulnerability/

Doc

[jmambu]

Hi,
Thanks for the response. I might don't know what I did that cause it to undervolting. (Or maybe someone else have change the configuration). How can make it to not undervolting?

Also, how to reset the BIOS to default?

[AlHill]

Contact your system manufacturer for information on how to reset their bios.

Doc