million OP , 2 months ago

Here is my understanding of this now I've got everything working on my Flatpak install of Steam:

MangoHud

• Mangohud is installed as another Flatpak, org.freedesktop.Platform.VulkanLayer.MangoHud
• I don't think I ever installed this manually, I believe the Steam Flatpak will bring this as a dependency
• To tell a game to use MangoHud you add MANGOHUD=1 %command% to the Steam launch options of the game
• Alternatively you can use like Flatseal to add MANGOHUD=1 to the Steam FlatPak to get this working in every game by default

Gamemode

• You need to install the Gamemode daemon, gamemoded as a system package
• Once that is installed you can add gamemoderun %command% to the launch options to run the game with Gamemode enabled