Laptop cpu multiplier locked when using battery

[Rska96]

Hey All, first post on the forum.

I bought an Acer laptop with a Ryzen 5 2500u processor and recently noticed that the cpu clock speed was capped at 1.6GHz when on battery power. The base clock of the processor is supposed to be 2GHz. I ran CPU-Z and noticed that the multiplier was locked to 16 when on battery. Is this a bug or a "feature" to extend battery life (if it is for battery life, they shouldn't have bothered because the battery only lasts 2 hours). Are there any workarounds to "unlock" the cpu when on battery. And before you ask, I have tested using the high-performance power plan, reason I mention this is that every thread I've found on similar issues, half the responses were to try the high-performance power plan. Also, I have the latest bios from Acer and all my drivers are up to date.

[TempestCatto]

In power options you should be able to set it to "high performance" then change the advance settings and under processor management change the minimum processor state.

 

Change advance power settings > processor power management > there should be something about minimum processor state and active cooling policy. It might be 5% which is low, just change it to 100% but be advised you will have less battery life.

[Rska96]

I tried that, it doesn't seem to make a difference. Clock speed capped at 1.6GHz, cpu multiplier still capped at 16. When plugged in, the cpu multiplier sometimes reaches 36, and clock speeds reach 3.2GHz.

[genexis_x]

I think it's a limitation by firmware/BIOS

[Rska96]

why wouldn't they make a custom power plan so that end users could choose to change it instead of limiting power usage in the BIOS.