Hominine

screen_off = “qdbus org.kde.kglobalaccel /component/org_kde_powerdevil invokeShortcut ‘Turn Off Screen’” I use this on deck and the following on desktop where the monitors automatically shut off: “kscreen-doctor output.DP-2.disable” hope it helps!

Commented elsewhere in this thread with details on persistence in steamos if you’re interested. glhf!

FYI, there is now an overlay for /etc that stores changes in /var and files can also be noted as persistent in /etc/atomic-update.conf.d.
Valve has also added a persistent /nix folder for declarative package management if you’re into that kind of thing, it has been glorious in my little world.