Arch Linux

SergentPepper

Member

Registered: 2014-07-19

Posts: 10

cannot load PHC module - solved

Hello,

First off, i'm not sure where I should post this, so feel free to move if it's in the wrong place.

Then, I'm trying to use PHC (phc-intel) to undervolt my cpu, which is a i7 3687U.
The installation and creation of the module ($ phc-intel setup) both seem to work fine, but when it comes to running the mprime-phc-setup script (from the wiki) the output is :

The PHC module doesn't seem to be loaded.

I've tried

# modprobe phc-intel

but nothing changes (no error message, but "$lsmod | grep acpi" returns nothing).It also seems that the acpi_cpufreq module is not loaded ("$lsmod | grep acpi" returns nothing) but

# modprobe acpi_cpufreq

does nothing either (no error message, but no module loaded)

So should i conclude that my cpu doesn't support phc, or did I do something wrong during the procedure ?

Any help will be highly apreciated
SergentPepper

Last edited by SergentPepper (2014-08-01 14:08:12)

ooo

Member

Registered: 2013-04-10

Posts: 1,638

Re: cannot load PHC module - solved

afaik PHC doesn't work with newer intel processors (at least sandy bridge and later shouldn't work).

SergentPepper

Member

Registered: 2014-07-19

Posts: 10

Re: cannot load PHC module - solved

So it is impossible to undervolt sandy brigde/newer processors ?

Last edited by SergentPepper (2014-08-01 13:43:44)

ooo

Member

Registered: 2013-04-10

Posts: 1,638

Re: cannot load PHC module - solved

afaik with PHC it is impossible. May be possible from your bios.
although if I'm not mistaken, undervolting shouldn't make that big of a difference these days on modern cpus with deep sleep states.

Last edited by ooo (2014-08-01 13:57:38)

SergentPepper

Member

Registered: 2014-07-19

Posts: 10

Re: cannot load PHC module - solved

Ok thanks solved !