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GNOME Shell Making It Easy To Launch Apps/Games For Optimus / Dual GPU Systems
When a dual-GPU system is detected, a menu item will be added to opt for "Launch using Dedicated Graphics Card", per this commit. The GNOME Shell change for supporting discrete GPUs was made and when the user opts to launch on the dedicated GPU, the DRI_PRIME=1 environment variable will automatically be set for that new program/game.
It's nothing that couldn't be done before when launching from the command-line or when manually modifying your shortcuts, but now it's easier to do for applications you are launching from the GNOME Shell where sometimes you may want to run it on the dedicated GPU using DRI_PRIME. These latest patches to the GNOME Shell are working to address this GNOME bug report about "Add a way to launch an app on the discrete GPU" with Optimus being the primary use-case.