[Sandi1987]

I have problem with 100% CPU usage at idle since i buy it on Xiaomi Redmi Note 8 Pro. Battery draining so fast especially in games. CPU Usage never goes below 25% at idle. Bad unit or?

Should i downgrade OS to MIUI 10?

[B. Diddy]

Does it also use 100% CPU in Safe Mode? https://www.getdroidtips.com/boot-xi...pro-into-mode/

[Sandi1987]

Yes. Battery drain is the same in Safe Mode. Do i got bad unit?

[B. Diddy]

Sounds like that could be the case. What are you using to measure the CPU acitivity?

[Sandi1987]

CPU-Z and CPU Monitor.

What's wrong with my phone? Bad CPU, battery or it's just OS?

[B. Diddy]

I'd guess either corrupt firmware or a faulty CPU. The first thing to try would be a factory reset.

[Sandi1987]

I did Factory Reset and it's the same.

[mustang7757]

You have insurance or warranty?

[B. Diddy]

Next step would be to reinstall the firmware, if possible. Try this: https://c.mi.com/thread-2637280-1-0.html. (Sorry, but I wouldn't be able to help in more detail, since I have no experience with this process.)

Otherwise, look into getting a replacement if the phone is still under warranty, or bring it to a repair shop.

[Sandi1987]

I had the same problem with Xiaomi Redmi 8A and it had even higher CPU usage at idle with no apps opened then Redmi Note 8 Pro. I bought it in the same store.

[Sandi1987]

I think it's not OS because i lose 1% battery just in Fastboot Mode after 1 minute. What about bad battery?

[mustang7757]

I think it's not OS because i lose 1% battery just in Fastboot Mode after 1 minute. What about bad battery?

Check in CPU-Z app what the battery volts and temp at, can give some indication , and yes lower voltage or failing battery can cause issues on CPU . But these things only a real good repair shop can test .

[Sandi1987]

Here is CPU-Z screenshot.

[mustang7757]

Looks ok

[Sandi1987]

So, it's CPU or bad battery? Battery Drain start when i first time turn on phone. The same with Redmi 8A.