Laptop CPU stuck at 400MHz at all times.

[smilingcrow]

Latitude 5175 with a Core M m5-6Y57 rated at 1.10-2.80 GHz and stuck at 400MHz.
I installed the Intel utility that allows you to monitor clock speed, load and temperature and even when loading it 100% with Prime95 it stays at 400Hz.
Temperature is around 45c and hardly budges even at load due to how little power its using.
Have latest BIOS and reset to defaults and checked settings and everything looks normal.
Help!

 

[smilingcrow]

Good man, there are no CPU settings in the single power plan which is Balanced.
I'll have to see how to add some.

 

[smilingcrow]

Are you running on battery or adapter? I had this problem with an old laptop and it turned out to be that there were two adapters and running on the smaller adapter with no battery in the laptop would lock the CPU to 700Mhz. I had to get the bigger adapter to solve the problem. Maybe that is of some help.

Thanks. The issue is there on battery or mains and I'm using the same adapter as always which has plenty of headroom but I will try another adapter with a higher rating just in case.

 

[smilingcrow]

Im not sure whether its the same thing but my 7700k was stuck at 800mhz, there was a problem with thermal throttling, I can switch this off in the bios or you can use a programme called Throttlestop which does the same thing.
I ended up getting a replacement processor in the end. Might be worth five minutes to give it a go

Thanks. I ran Intel's Extreme Tuning Utility and it showed that thermal throttling wasn't at play and the CPU temp was only in the 40s.
I haven't used Throttlestop for ages but worth giving it a go just in case.

 

[smilingcrow]

Thanks. I've just downloaded it and run it. It doesn't show any obvious warning but it does have the elegance of much Freeware so maybe I missed it!
Is it obvious when it reports throttling?