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tang01
Adept I

Re: AMD Ryzen 5 2500U locked to 400MHz on battery

This problem seems to be related to the ambient temperature, and the low temperature will be down.

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blakegriplingph
Adept I

Re: AMD Ryzen 5 2500U locked to 400MHz on battery

HP did release an updated BIOS image (F.24 Rev.A) for the 14-cm0072au but I am still getting the 15%/0.38GHz throttling issue.

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geblaat
Adept I

Re: AMD Ryzen 5 2500U locked to 400MHz on battery

Hi,

Just wanted to add  that I've got similar issues with an HP notebook 17-ca0992nd. When I shut down the laptop on AC-power, and then boot on battery, the CPU is locked at 0,38Ghz. The laptop has an Ryzen 2500u processor. Latest BIOS update from HP (F41 rev A from june 2019) does not fix this problem.

Oddly my other laptop (Lenovo Yoga 530) with Ryzen 2200u doesn't have this problem.

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squilliam
Adept I

Re: AMD Ryzen 5 2500U locked to 400MHz on battery

Asus Zephyrus with a 3750H. 

I get the same issue.

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blakegriplingph
Adept I

Re: AMD Ryzen 5 2500U locked to 400MHz on battery

Have you looked at ASUS's support page for your laptop to see if there's an updated BIOS?

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squilliam
Adept I

Re: AMD Ryzen 5 2500U locked to 400MHz on battery

The last bios was released 3 days ago, abd it didn't fix it.

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huflungdung
Adept I

Re: AMD Ryzen 5 2500U locked to 400MHz on battery

I had same issue with "AMD Ryzen 3 2300U with Radeon Vega Mobile Gfx, 2000 Mhz, 4 Core(s), 4 Logical Processor(s)". It happened many times over 2 or 3 days seriously affecting my work. The issue then 'fixed' itself  yesterday 2020.01.08 I think when I rebooted whilst disconnected from mains power. Unfortunately I installed the latest BIOS and so did not isolate the cause(s) but it hasn't recurred thus far. I will continue to monitor..

Update:  Upon unplug, throttles back immediately to 0.38GHz , screen dims (due to power settings I guess) then back up to 2.38 GHz when I run HP CPU stress test. 

When plugged-in stress test gets up to max ~3.21GHz. 

This would seem to be fairly reasonable behaviour but I don't know the specs. There are a lot of threads on this significant issue!..

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huflungdung
Adept I

Re: AMD Ryzen 5 2500U locked to 400MHz on battery

Forgot to mention: prior to BIOS update I was experiencing a bogus fan error on boot which has subsequently resolved

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huflungdung
Adept I

Re: AMD Ryzen 5 2500U locked to 400MHz on battery

Nope! Still not fixed! 16/1/20. Only works when plugged in!

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huflungdung
Adept I

Re: AMD Ryzen 5 2500U locked to 400MHz on battery

OK. This is either fixed by the BIOS update or else is intermittent as currently pc is working on battery alone.

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