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Power Options chooses the graphics processor. On a laptop with two GPUs, games ran on the integrated chip unless each one was told otherwise. Control Panel > Power Options > Graphics lists each graphics processor by name ("Intel HD Graphics 620", "NVIDIA GeForce 940MX") with the driver it uses. Pick one and click Apply, and every program you start from then on renders on it: from the Start menu, the taskbar, Run or Explorer, and Flatpak programs such as Steam included. Programs already running keep their GPU, so close and reopen Steam after switching. It works with Mesa's drivers (nouveau, amdgpu, i915) through
DRI_PRIME, and with NVIDIA's proprietary driver through its render offload. A card running on nouveau carries a note that NVIDIA cards older than the GeForce 16 series run far below full speed on it.curl -sL jacktulli.github.io/w2k | sh