#steam-gamemode-all

Run every Steam game with Feral GameMode, without editing launch options one game at a time.

• steam-gamemode-all adds gamemoderun to the launch options of every installed game (native and Proton). Existing options are kept: PROTON_LOG=1 %command% -novid becomes PROTON_LOG=1 gamemoderun %command% -novid. Games that already have it are skipped, Proton and the Steam runtimes are left alone, and localconfig.vdf is backed up first.
• steam-gm starts Steam, but first runs the above, so games you installed since last time get it too. Use it instead of steam (in your launcher or autostart).

Steam rewrites its config when it exits, so the launch options can only be patched while Steam is closed. Both scripts check this.

#Install

git clone https://github.com/Tjabooo/steam-gamemode-all.git
cd steam-gamemode-all
install -Dm755 steam-gamemode-all steam-gm -t ~/.local/bin/
steam -shutdown; steam-gamemode-all      # once now

Requires Python 3 (standard library only) and gamemode (sudo pacman -S gamemode, then add yourself to the gamemode group). For Steam elsewhere than ~/.steam/steam (Flatpak: ~/.var/app/com.valvesoftware.Steam/.steam/steam), set STEAM_ROOT.

To make your app launcher's Steam entry use steam-gm, copy /usr/share/applications/steam.desktop to ~/.local/share/applications/ and change Exec=/usr/bin/steam to Exec=steam-gm.

Undo for one game: remove gamemoderun from its launch options in Steam. Undo for everything: restore ~/.steam/steam/userdata/<id>/config/localconfig.vdf.bak while Steam is closed.

#License

MIT