ERROR: Could not open CPU for reading! Is the msr kernel module loaded?

[EljoDev]

When I try to do something ex: $ ./amdctl -g :

Voltage ID encodings: SVI (serial)
Detected CPU model 30h, from family 16h with 4 CPU cores.
ERROR: Could not open CPU for reading! Is the msr kernel module loaded?

I have tryed modprobe msr but noting

How do I solve this error ?

[kevinlekiller]

If you're running Linux >= 5.9 ; MSR is not available to user space, see #25

https://www.phoronix.com/scan.php?page=news_item&px=Linux-Filter-Tightening-MSRs

[kevinlekiller]

Also, you'd have to run amdctl as root (sudo ./amdctl).

I have tryed modprobe msr but noting

You can check if the module is loaded : lsmod | grep msr

Then you should see something like msr 16384 0

You can also check if the module is available: sudo modinfo msr :

filename:       /lib/modules/5.13.4-1-default/kernel/arch/x86/kernel/msr.ko.xz
license:        GPL
description:    x86 generic MSR driver
author:         H. Peter Anvin <hpa@zytor.com>
suserelease:    openSUSE Tumbleweed
srcversion:     85BAD85AC4133DB42A2C6C6