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.
Checkout this repository or download the latest release sources.
Then, from inside the source directory run:
$ sudo make install
$ sudo systemctl enable amd-disable-c6.service
$ sudo systemctl start amd-disable-c6.serviceThe 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:
$ sudo modprobe msr #enable until next reboot
$ sudo sh -c "echo msr > /etc/modules-load.d/msr.conf" #auto-enable at boot time