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My 1yr old laptop, HP Pavilion 15 has it's CPU, Intel i5-8300H stuck at 0.78 GHz whenever it's plugged and charging, and the moment I remove the charger plug or switch it off, it increases suddenly and keep fluctuating freely, with good utilisation percentage more than 1-2GHz or more as I experience Thermal Throttling.

I tried sneaking into the BIOS to see if I can do anything, but found nothing. I also downloaded Intel Extreme Tuning Utility (XTU) but couldn't control it.

My question is how do I increase the speed to say atleast 2 GHz (fixed, not fluctuating) when it's charging, irrespective of getting thermal throttle, and also maybe even control the fan speed if it does get hot?

GeassDragon
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This is a known bug with Windows 10 20H2.

You will either need to rollback your latest update, figure out a way to install KB4580364, or wait for Microsoft to give you a fix using the regular update mechanism.

Here is a page confirming the problem: https://windowsreport.com/windows-10-slow-cpu-frequency/

Here is the Microsoft page that shows ways to get the patch: https://support.microsoft.com/en-us/help/4580364/windows-10-update-kb4580364

PLEASE NOTE that this fix is still BETA (preview) software. You need to ask yourself if you want to install another guess at a fix or roll back.

Señor CMasMas
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I have had a similar problem the last 2 times I upgraded windows 10 on my Lenovo X1 Carbon. The CPU is stuck at 0.78 Ghz. This is the way I have fixed it these 2 times. (Last upgrade was to 20H2) I got this fix somewhere on the net. Don't know why it works.

  1. Unplug the power.
  2. Shut down the PC.
  3. Restart the PC on battery power.
  4. Plug the power back in.

After that, the CPU happily speeded up past the base frequency of 2.69 GHz, to 3 GHz and beyond as needed. This seems (for me) to be a permanent fix until the next Windows upgrade.

Martin m Graham
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I have 2 identical dell laptops with identical specs (i3-4005u, 4gb ddr3)

I noticed one day that whatever happened, the cpu clocks on one laptop won't go above 798 Mhz,

I tested both machines on different OSs for months without battery, so it wasn't a battery problem huh.

Then I tried switching the power brick from the one that worked fine to the one whose cpu won't ramp up, and it worked.

So I concluded that it was due to a powerbrick limitation it didn't work well. Both powerbricks for both laptops were bought from 3rd party vendors.

I hope this is helpful for anyone facing the same issue on laptop.

There are some other solutions you should try first,

Remove the battery and start on charger power and restart and install battery.

Also try disconnecting  the charger and reconnecting it, that worked too when I had installed battery in the laptop which had its cpu clocks stuck at 798 Mhz

Jaitra Shah
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I was suffering this issue with my HP laptop.

What I did to fix it was by making sure I was updated to the latest BIOS on the HP website for my product, then resetting the BIOS to default settings.

If you are already on the latest BIOS for your laptop, then just go into the BIOS and reset settings to default.

Also, make sure to check for updates on Windows Update and HP Support Assistant. This issue seems to be quite a common bug with some HP laptops.

Virtuality
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I just encountered the exact same problem with Windows 10 and Windows 11 on a Dell XPS 13 Ultrabook. After Upgrading the BIOS to the newest version, some new options appeared. One was related to the power state of the CPU. This specific BIOS option allowed the Operating System to regulate the CPUs power states instead of the chipset. After disabling this option, the Processor worked just fine, turboing to over 3GHz and 100% CPU utilization when needed. For some reason, Windows seems to mess with the power states of specific notebook configurations.

Paprick
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Update your system BIOS.

I had a similar issue with my Lenovo E580 laptop, running Windows 11 (22H2). Task Manager always reported CPU speed at 0.8 GHz. Changing power options had no impact.

Lenovo automatic update tool found a newer BIOS. After installing it (no reconfiguration) the clock speed behaved as it used to: It varies between 0.8 and 3.4 GHz, depending on system load.

Peer Sommerlund
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I'm not sure if you have tried this, but:

  1. Right Click on the battery icon

  2. Go to Power Options

  3. Click on Change plan settings for the High Performance plan (if you don't have one, you can create one using the Create a power plan option on the left)

  4. Under Processor power management:

    4.1. Set the Minimum processor state to 100%

    4.2. Set the Maximum processor state to 100%

    4.3. Set the System cooling policy to Active

Leopard20
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I had the same issue on Windows 11.
Thanks to other answers I found a solution that hopefully might help you as well.
Go to Control Panel > Hardware and Sound > Power Options and switch from Ultimate Performance to Balanced. This did the trick for me.

TheFabbius
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