Envy x360 AMD 3700U CPU frequency stuck at 400MHz randomly

[MikeSLee]

Hello, my laptop's CPU will randomly drop its frequency to 400MHz.

The only way to solve this by now is to open HP command center, and the frequency will be back to normal. If not, just picking one of the other three thermal profiles.

I've update all driver and BIOS, and I believe it's a BIOS issue.

Besides, the hardware acceleration on this machine is barely usable, GPU usage sometimes stuck at 100% and can't even watch youtube video.

[MikeSLee · Accepted solution]

I think I've figured out what was happening.

Firstly, this computer's BIOS is locked at maximum of 25 watt power usage. After the boosting period, the total power usage will be hard locked at 10 watt.

Secondly, since the pandemic, I've connected my laptop to my 2K 170Hz gaming monitor via type-c alt mode, and output the signal to my monitor can easily eat up 6-10 watt total power usage budget.

Therefore, whenever I try to do something CPU intensive tasks, CPU throttled.

HP's firmware isn't smart at all. My CPU and GPU temp are totally within limit, but HP decide to limit the usability of my laptop.

Disappointed.