https://github.com/joakimkistowski/amd-disable-c6

Systemd service to automatically disable the C6 power saving state on AMD Zen (Ryzen / Epyc) processors
https://github.com/joakimkistowski/amd-disable-c6

amd systemd

Last synced: 14 days ago
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Systemd service to automatically disable the C6 power saving state on AMD Zen (Ryzen / Epyc) processors

• Host: GitHub
• URL: https://github.com/joakimkistowski/amd-disable-c6
• Owner: joakimkistowski
• License: mit
• Created: 2018-12-18T12:01:55.000Z (almost 6 years ago)
• Default Branch: master
• Last Pushed: 2024-08-29T08:30:29.000Z (3 months ago)
• Last Synced: 2024-08-29T09:48:22.828Z (3 months ago)
• Topics: amd, systemd
• Language: C++
• Size: 12.7 KB
• Stars: 59
• Watchers: 6
• Forks: 5
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# amd-disable-c6

This is a systemd service to automatically disable the C6 power saving state on AMD Zen (Ryzen / Epyc) processors. The C6 state is known to occasionally freeze Linux distributions running Zen-based processors in deep idle. This systemd service disables the C6 state on boot as a workaround for this bug. Of course, this is only a stop-gap solution until AMD releases a final fix to the underlying issue. 

## How to build and install

Checkout this repository or download the latest release sources.

Then, from inside the source directory run:

```bash

$ sudo make install

$ sudo systemctl enable amd-disable-c6.service

$ sudo systemctl start amd-disable-c6.service

```

## Troubleshooting

The most likely reason for the service to fail is the `msr` module not being present. It should be present on most distros, but some (e.g., Arch, Manjaro) do not have it enabled by default.

To enable the module:

```bash

$ sudo modprobe msr #enable until next reboot

$ sudo sh -c "echo msr > /etc/modules-load.d/msr.conf" #auto-enable at boot time

```