RyzenAdj is the primary tool for adjusting power limits (watts) and max temperature on Ryzen APUs in Linux, including CachyOS (Arch-based). CachyOS often uses amd-pstate in guided mode by default, which enforces OS-managed limits; disabling or switching this mode can help unlock higher performance.
Install RyzenAdj
CachyOS supports AUR packages via helpers like yay or paru.
Install an AUR helper if needed: sudo pacman -S –needed base-devel git then git clone https://aur.archlinux.org/yay.git && cd yay && makepkg -si.
Install RyzenAdj: yay -S ryzenadj (or paru -S ryzenadj).
Verify with ryzenadj –info.
Switch AMD P-State Mode
Guided mode limits boosts; switch to active or passive for more control.
Edit /etc/default/grub: Add amd_pstate=active (or passive) to GRUB_CMDLINE_LINUX_DEFAULT.
Or disable: initcall_blacklist=amd_pstate amd_pstate.enable=0.
Run sudo grub-mkconfig -o /boot/grub/grub.cfg and reboot.236
Check mode: cat /sys/devices/system/cpu/amd_pstate/status.
Set Power and Temp Limits
Run as root for persistence across sessions (add to systemd service for boot).
Example for 35W limits and 95°C max (adjust in mW and °C for your APU/cooling):
sudo ryzenadj –stapm-limit=35000 –fast-limit=35000 –slow-limit=35000 –tctl-temp=95
–stapm-limit: Short-term average power.
–fast-limit/–slow-limit: Fast/slow PPT.
–tctl-temp: Max temp throttle point.
Add VRMs if needed: –vrm-current=50000 –vrmsoc-current=50000
Monitor with ryzenadj –info or watch sensors. Test stability with stress tools like stress-ng.
Make Persistent
Create a systemd service:
sudo tee /etc/systemd/system/ryzenadj.service <<EOF
[Unit]
Description=RyzenAdj Power Limits
After=multi-user.target
[Service]
Type=oneshot
ExecStart=/usr/bin/ryzenadj –stapm-limit=35000 –fast-limit=35000 –slow-limit=35000 –tctl-temp=95
RemainAfterExit=true
[Install]
WantedBy=multi-user.target
EOF
Enable: sudo systemctl enable –now ryzenadj.service.1
Warning: Higher limits risk overheating/hardware damage; monitor temps and start conservative. BIOS PBO may also help if available
For managing and monitoring Ryzen APU wattage on CachyOS (an Arch-based Linux distribution), ryzenadj is the best CLI tool for changing TDP/power limits. It is often paired with GUI wrappers like Ryzen Controller