Undervolt not working on i5-1135G7 (Dell XPS 9310 DE)

[abraha2d]

Getting this error when running sudo undervolt --core -100 --cache -100 -v:

$ sudo undervolt --core -100 --cache -100 -v
INFO:root:Setting core offset to -100mV
INFO:root:Writing 0x80000011f3400000 to /dev/cpu/0/msr
INFO:root:Writing 0x80000011f3400000 to /dev/cpu/1/msr
INFO:root:Writing 0x80000011f3400000 to /dev/cpu/2/msr
INFO:root:Writing 0x80000011f3400000 to /dev/cpu/3/msr
INFO:root:Writing 0x80000011f3400000 to /dev/cpu/4/msr
INFO:root:Writing 0x80000011f3400000 to /dev/cpu/5/msr
INFO:root:Writing 0x80000011f3400000 to /dev/cpu/6/msr
INFO:root:Writing 0x80000011f3400000 to /dev/cpu/7/msr
INFO:root:Writing 0x8000001000000000 to /dev/cpu/0/msr
INFO:root:Writing 0x8000001000000000 to /dev/cpu/1/msr
INFO:root:Writing 0x8000001000000000 to /dev/cpu/2/msr
INFO:root:Writing 0x8000001000000000 to /dev/cpu/3/msr
INFO:root:Writing 0x8000001000000000 to /dev/cpu/4/msr
INFO:root:Writing 0x8000001000000000 to /dev/cpu/5/msr
INFO:root:Writing 0x8000001000000000 to /dev/cpu/6/msr
INFO:root:Writing 0x8000001000000000 to /dev/cpu/7/msr
INFO:root:Read 0x1f00000000 from /dev/cpu/0/msr
ERROR:root:Failed to apply core: set -99.609375, read 60000.0

This is what sudo undervolt -r says:

$ sudo undervolt -r
temperature target: -0 (100C)
core: 60000.0 mV
gpu: 60000.0 mV
cache: 60000.0 mV
uncore: 60000.0 mV
analogio: 60000.0 mV
powerlimit: 64.0W (short: 0.00244140625s - disabled) / 64.0W (long: 28.0s - enabled)

These two lines are logged to dmesg when running undervolt (doesn't matter whether setting or just reading):

[  889.462018] filter_write: 15 callbacks suppressed
[  889.462020] msr: Write to unrecognized MSR 0x150 by undervolt (pid: 6828). Please report to x86@kernel.org.

uname: Linux 5.10.0-1008-oem #9-Ubuntu SMP Tue Dec 15 14:22:38 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux Installed undervolt with sudo python3 -m pip uninstall undervolt.

[georgewhewell]

you can try adding msr.allow_writes=on to your kernel commandline. userspace applications (even as root) are being blocked from accessing these msr in new kernel versions :/

[abraha2d]

Hmm, tried adding msr.allow_writes=on to the kernel command line, but I still get the same results. The only difference is that it no longer prints those logs to dmesg.

[rcurtin]

Same issue and output here on a Lenovo Yoga 7i (same processor), running Debian sid. Happy to try any suggestions or provide any more output if it could be helpful. :+1: (Thanks for the nice utility! I hope I can get it to work :))

[Areidz]

I've read somewhere that it's locked in these processors because of plundervolt vulnerability. I couldn't get it working on my MSI Modern 14.

[24fpsDaVinci]

same problem on xps 9310 with fedora 35, kernel 5.16

[papayayooo]

FIXME but I think 11th/12th gen Intel CPUs don't have undervolt enabled anymore due to Plundervolt (or other reasons). I wanted to buy a 12th-gen, but they are very power hungry so I wanted to use undervolt heavily. Turns out, you can't do that anymore.

[wrobelda]

For the record, motherboard manufacturers can choose to enable undervolting for 12th gen processors onwards. To check if one's motherboard is affected, one can check whether the "Undervolt Protection" is enabled by checking the IA32_OVERCLOCKING_STATUS with:

rdmsr -f 1:1 0x195

1 menas protection is enabled, 0 means it's disabled.

[aboode95]

one can check whether the "Undervolt Protection" is enabled

@wrobelda, so if "Undervolt Protection" is disabled (i.e. the command output is 0), I can undervolt?