This repository offers an easy way to undervolt a Steam Deck as safely as possible and without entering the BIOS or disabling read-only using RyzenAdj and systemd targets based on Chris Down's guide.
A precompiled version of RyzenAdj is provided for your convenience, built in Arch Linux from commit f6fbf9d17f70d9736bc8294ccd8438ae94804aa9.
As with any undervolt exercise caution, while this project greatly reduces the risk of bricking your deck, it does not in any way guarantee you won't damage your hardware. Use at your own risk.
Inside this repository is a home and etc folder, use this as a template to add these files to the root of your Steam Deck (You will need root to add files to the etc folder, and they will survive SteamOS updates). The file allowadj.txt must be writable by deck user and the files on.sh and off.sh must be executable by deck user.
Once completed, run the following to apply the added udev config:
sudo udevadm control --reload-rules
The undervolt amount can be changed by editing /home/deck/.local/bin/set-ryzenadj-tweaks.sh
By default a -5 curve optimization is applied (via -set-coall), which should be stable on most hardware.
In order to enable the on.shand off.shscripts that allows you to enable and disable undervolt from game mode run the following to apply the path listener:
systemctl enable --now set-ryzenadj-tweaks.path
Having done that you can add on.shand off.sh as non-steam apps and run them from game mode to control undervolt status. Useful to see effect of undervolt quickly.
sudo systemctl start set-ryzenadj-tweaks.service
Once you're happy with the undervolt and confirmed it's stable, run the following to ensure the undervolt is reapplied automatically going forward:
sudo systemctl enable set-ryzenadj-tweaks.service