Undervolt Doesn't Work

[muhlisgursoy]

Hi,

I've been using Throttlestop for 3 years. I used to use my laptop (Intel i5-8250U) with undervolting last year, it does work. But recently I tried to undervolt my CPU again but it just don't work. I applied it, checked the voltage on both HWinfo and HWMonitor and there are no undervolting on action. Why is that? It used to work but it doesn't working right now.

This was on TS 9.4.6, and I also tried TS 8.4 and still the undervolting doesn't work. I restarted my laptop, I even set the offset to -1000mV just to make sure if it works and it didn't crash -meaning that undervolt does not apply-.

@unclewebb

 

[dismission]

try to disable the Windows Hypervisor Platform

1. Press the Win + R to open Run.
2. Type control and click OK to open the Control Panel.
3. In the Control Panel, go to Programs > Programs and Features.
4. In the left panel, click on Turn Windows features on or off.
5. In the Windows Features dialog, select/deselect Hyper-V

I am currently unable to change the cache voltage....a few days ago everything worked

 

[muhlisgursoy]

try to disable the Windows Hypervisor Platform

1. Press the Win + R to open Run.
2. Type control and click OK to open the Control Panel.
3. In the Control Panel, go to Programs > Programs and Features.
4. In the left panel, click on Turn Windows features on or off.
5. In the Windows Features dialog, select/deselect Hyper-V

I am currently unable to change the cache voltage....a few days ago everything worked

Nope, I just disabled it and restarted the laptop, and still, Throttlestop doesn't applying the undervolt.

 

[dismission]

Nope, I just disabled it and restarted the laptop, and still, Throttlestop doesn't applying the undervolt.

try to disable Intel VT in BIOS

what brand/model is your laptop? have you updated all the drivers?

 

[unclewebb]

@muhlisgursoy
The default Windows 11 virtualization features disable CPU voltage control. This prevents ThrottleStop from reading and writing to the CPU voltage control register.

There are threads in the ThrottleStop forum that explain what Windows 11 features need to be disabled. Virtual Machine Platform, Hyper-v, core isolation memory integrity and WSL2 are some of the things that have to go.

Delete the ThrottleStop.INI file and try again. If the FIVR monitoring table shows a column of voltages like 0.3799, you need to disable more stuff.

 

[muhlisgursoy]

Virtual Machine Platform, Hyper-v, core isolation memory integrity and WSL2

All disabled, deleted the .ini file and tested again, still it isn't working. I read on some threads that a BIOS flashback is required but the latest version of the BIOS on my laptop is 1.08, it was 1.08 when TS undervolt was working and now it's on 1.08 too.

 

[dismission]

All disabled, deleted the .ini file and tested again, still it isn't working. I read on some threads that a BIOS flashback is required but the latest version of the BIOS on my laptop is 1.08, it was 1.08 when TS undervolt was working and now it's on 1.08 too.

flash the previous version then the last
try older versions of TS.... 9.3...9.4...9.4.3..it worked for me

 

[unclewebb]

still it isn't working

Post another screenshot of the FIVR window. That will show if ThrottleStop is not working because of a Windows virtualization setting or if ThrottleStop is not working because your BIOS has locked out CPU voltage control. Installing a previous BIOS version does not always disable the voltage control lock.

try older versions of TS

No need to. This is not a ThrottleStop problem.

 

[muhlisgursoy]

Post another screenshot of the FIVR window.

Here it is.

try older versions of TS.... 9.3...9.4...9.4.3..it worked for me

It's not working because I tested TS 8.4 and still the undervolt doesn't apply as I said in the first post.

 

[unclewebb]

The voltage column in the FIVR monitoring table still shows a column of 0.3799. That means there are more Windows 11 features that you still need to disable.

Where is a screenshot of the Windows 11 Features window? You still have something enabled in Windows 11 that needs to be disabled. I am only on Windows 10 at the moment. My Features list looks like this. You have to look through that list for anything virtualization related.

 

[muhlisgursoy]

The voltage column in the FIVR monitoring table still shows a column of 0.3799. That means there are more Windows 11 features that you still need to disable.

Where is a screenshot of the Windows 11 Features window? You still have something enabled in Windows 11 that needs to be disabled. I am only on Windows 10 at the moment. My Features list looks like this. You have to look through that list for anything virtualization related.

View attachment 244147

This is how it looks like.

 

[dismission]

View attachment 244151
This is how it looks like.

remove windows hypervisor platform.....

 

[muhlisgursoy]

remove windows hypervisor platform.....

I disabled it, restarted, and tried undervolting again... FIVR still looks the same, and undervolt isn't applying.

 

[unclewebb]

FIVR still looks the same

Did you delete the ThrottleStop.INI configuration file? This file seems to get corrupted when you run with the virtualization features turned on.

Does your bios have any VT settings in it?

 

[muhlisgursoy]

Did you delete the ThrottleStop.INI configuration file? This file seems to get corrupted when you run with the virtualization features turned on.

Yes, every time I disabled something and restarted the laptop, I delete the .ini file before trying to undervolt again.

Does your bios have any VT settings in it?

Yes, there are VTX and VTD settings on the BIOS which are both enabled. But it was both enabled when the undervolt worked.

 

[unclewebb]

there are VTX and VTD settings on the BIOS which are both enabled

Try disabling them.

When you reboot, hold down the Shift key on your keyboard to do a full reboot.

 

[muhlisgursoy]

Try disabling them.

When you reboot, hold down the Shift key on your keyboard to do a full reboot.

Thanks a lot! It worked!

But disabling them, what features are now unavailable on my laptop? Is it gonna affect the daily use, or can it degrade the performance?

 

[unclewebb]

can it degrade the performance?

Turning all that crap off will likely improve performance.

If you are not using any of those virtualization functions then they do not need to be enabled. There was no reason for Microsoft to block access to the voltage control register. Why that register? If you are going to block access to the voltage control register then they should block access to the 101 other registers.

If you are bored you can go back and try turning on some of the Windows 11 features one by one to see which ones block voltage control.

try to disable Intel VT in BIOS

You should have listened to this advice on Sunday.

Thanks for sticking it out to the end. This will help other users in the future. I will send them to this thread. Avoid updating your bios. Not worth the risk of losing voltage control.

 

[muhlisgursoy]

You should have listened to this advice on Sunday.

Yes, I didn't think that would be the reason because the setting was exactly the same when the undervolt worked on Windows 10. I should have done that.

Thank you @unclewebb and @dismission for your help. I appreciate it a lot

 

[randomA]

Hi folks, having a similar problem as the OP.
Here is my screenshots:

Running Win11 and even tried deleting the .ini file as well. What should I do here?

Thanks in advance.

 

[phanbuey]

Hi folks, having a similar problem as the OP.
Here is my screenshots:

View attachment 244518
View attachment 244519
View attachment 244520

Running Win11 as well. What should I do here?

Thanks in advance.

Turn off Intel Virtualization Technology (VT).

 

[randomA]

Turn off Intel Virtualization Technology (VT).

You mean in bios? As you can see from the photo, it's already off.

 

[muhlisgursoy]

You mean in bios? As you can see from the photo, it's already off.

What is your processor model? Looks like even the FIVR option is locked.

 

[randomA]

What is your processor model? Looks like even the FIVR option is locked.

Intel Core i7-9750H 6 x 2.6 - 4.5 GHz, Coffee Lake-H

for the record, throttlestop has always worked (i think up til win11 )

 

[Chrispy_]

Yes, I didn't think that would be the reason because the setting was exactly the same when the undervolt worked on Windows 10. I should have done that.

Those BIOS settings were completely ignored by windows 10 unless you were running W10 Enterprise or W10 Pro for Workstations editions.