2 questions about my Lenovo X270, Plz assist

1. Why Win10 automatically limited the CPU usage to a maximum of 14% (shown in task manager) when the battery is lower than 50% without charging?

2. The latest HD620 driver has been installed through Win10 updates, but why Chrome still cannot decode FHD/4K (vp9) when watching videos in youtube? (task manager showed CPU 100%/GPU 0%)

Thanks in advance.

dalchina said:

Why does your Win 10 limit CPU usage when using battery?

Possibly because of this setting:


More likely because of this:
How to Turn On or Off Battery Saver in Windows 10
(from the huge searchable Tutorials section - do have a look.. very worthwhile)

- which apparently does more than control brightness (see comments following, especially post #3 on Lenovo

I.e. you may have a Lenovo utility that is throttling your CPU usage.

Another related angle (the above is more likely in your case):
Change Power Mode Level in Windows 10

and see link to
Introducing Power Throttling in Windows 10

Battery saver already turned off and I set power plan to "High Performance" but still cannot fix it
Also, I did not install any Lenovo utilities for ThinkPad

Please help.

Thanks dalchina, issue 1 was solved. Can help me on issue 2?

"Video Decode" always 0%


Already enable hardware acceleration in browser


Thanks.

dalchina said:

Good- what was the cause?

FWIW people have reported issue when using hardware acceleration... causes browser crashes. There was a recent thread on that.

Have you tried with a different browser?

And as that may be Chrome-specific, try a Chrome forum...

I am using Opera instead of Chrome but it's Chrome-based

P.S. I did not do anything but CPU no more drop to 14% limit now

Solved all problems, thanks all.