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This is something bazzite has been shipping for a while, so putting it here for comment
Switcheroo is a GPU switching system that is used by both KDE and GNOME to select the correct GPU on multi-GPU systems when requested by an application. The Steam desktop file has the entry that triggers both DEs to run it using switcheroo, so this matches the same behavior in the gamescope session. Gamescope will use the same GPU it does now (or the one selected by the user with export-gpu) and Steam will run on the alt-GPU selected by Switcheroo.
This makes it easy to run gamescope on an iGPU and Steam + Games on a dGPU on a laptop.
Do we want Steam running on the discrete gpu?
My understanding from my own testing is that Steam already takes care of launching games with the discrete GPU.
Having gamescope and Steam running on the integrated GPU gives games full access to the GPU and results in a much smoother experience when using the Steam overlays/menus, etc.
I haven't tested this in a while though, so things may have changed.
Oh, it may also be better for battery life to run Steam on the iGPU.
I was curious about if it can help optimize power usage on laptops, too.
I used powertop to monitor the power usage when using switcherooctl on my laptop (Intel Xe iGPU + NVIDIA 3060M dGPU) to launch steam. I compared launch (launching Steam itself, not a game), idle, and download (game downloads) wattage. They were consistently the same whether I was using the iGPU or dGPU: launching = 12 watts, idle = 2 watts, downloads = 25 watts.
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This is something bazzite has been shipping for a while, so putting it here for comment
Switcheroo is a GPU switching system that is used by both KDE and GNOME to select the correct GPU on multi-GPU systems when requested by an application. The Steam desktop file has the entry that triggers both DEs to run it using switcheroo, so this matches the same behavior in the gamescope session. Gamescope will use the same GPU it does now (or the one selected by the user with export-gpu) and Steam will run on the alt-GPU selected by Switcheroo.
This makes it easy to run gamescope on an iGPU and Steam + Games on a dGPU on a laptop.