mihic / linux-intel-undervolt Goto Github PK

I first want to congratulate you on the work you've done. It's really impressive. It would be really nice though if there was a program that was able to do this instead of needing to manually tweak offsets and stuff. I would be happy to help make this, although I do not fully understand the process yet (I am trying to follow the instructions, but I don't think it's working).

Hi there,

Thank you for making a tool for undervolting.
I have an older Intel i5 sandy bridge CPU that I would like to undervolt under Ubuntu. Since this tool is only for Haswell and newer processors, what tool should I use for the sandy bridge CPU?

Thank you very much.

All in the title, would it be difficult to port it to Windows ? It's much easier to use than throttlestop...

Unfortunately, http://forum.notebookreview.com/threads/the-throttlestop-guide.531329 became inaccessible for now, it says "Thank you for visiting the TechnologyGuide network. Unfortunately, these forums are no longer active."

The latest snapshot of this forum is from 2022.jan.26: https://web.archive.org/web/20220126143452/http://forum.notebookreview.com/threads/the-throttlestop-guide.531329/

In your guide you have:-

"The second number after FIVRVoltage is another index which I don't really know what it means"

Pretty sure that number is the ThrottleStop Profile. The fact that for you it is '2' all the time means you have the 3rd profile (by default that's called 'Internet') selected. In my case it was '0' all the time, as I'm just altering the initial 'Performance' profile.

Just thought I'd mention that, and this seemed the best place rather than the notebookreview forum thread.

I used the following commands to undervolt respectively my CPU, iGPU and CPU cache:
wrmsr 0x150 0x80000011f4800000
wrmsr 0x150 0x80000111fb200000
wrmsr 0x150 0x80000211f7c00000
When I execute
wrmsr 0x150 0x8000001000000000
and then
rdmsr 0x150
the output is f4800000, which is fine. However, after executing
wrmsr 0x150 0x8000011000000000
and
rdmsr 0x150
I get 100fb200000. Doing the same with plane index 2 returns 200f7c00000.
Is this normal? What do the first three figures mean? I tried this on an Intel Core i5-4210u.

Hi can you make it work also on all intel cpu like windows app throttlestop can work with older and newer intel cpu.

On i7 8750h Ubuntu 18.10. I need to issue intel-undervolt apply twice for TDP values to be set. Is this normal? Setting apply once does not work as intel-undervolt read still readings default bios values of 50 45.

$ sudo apt-get install msr-tools
$ sudo rdmsr 0x150
rdmsr: CPU 0 cannot read MSR 0x00000150
$ sudo wrmsr 0x150 0x8000001000000000
wrmsr: CPU 0 cannot set MSR 0x00000150 to 0x8000001000000000
$ sudo wrmsr 0x150 0x80000011F9A00000
wrmsr: CPU 0 cannot set MSR 0x00000150 to 0x80000011f9a00000

i5-3320M Ivy Bridge
Ubuntu 16.04 LTS