> Of course that means that games that do not support 1280x720 wont work at all,
On capable hardware (which your's probably isn't, not sure of Intel HD 405 capabilities), it is not a problem. The compositor can allocate a surface that corresponds to a given resolution (higher or lower than physical one, doesn't matter), the application renders its output at its preferred resolution and then compositor scales that buffer (using the output encoder's scaler, not GPU!) to physical output, effectively emulating that resolution.
Well, at least Mutter is capable of doing this, not sure of wlroots.
On capable hardware (which your's probably isn't, not sure of Intel HD 405 capabilities), it is not a problem. The compositor can allocate a surface that corresponds to a given resolution (higher or lower than physical one, doesn't matter), the application renders its output at its preferred resolution and then compositor scales that buffer (using the output encoder's scaler, not GPU!) to physical output, effectively emulating that resolution.
Well, at least Mutter is capable of doing this, not sure of wlroots.