Plugging in an external display and fullscreening an application on it is what this MR helps. On most laptops the dGPU does not drive the integrated display, but drives external displays through the HDMI port on the sides/back of the laptop. 'In the case of dual-GPU laptops there are a couple scenarios this impacts. Austin Shafer explained in the merge request and some of the future work: With this initial implementation it will just benefit secondary GPUs that are attached directly to a display, such as an external monitor connected to a multi-GPU laptop. Though the wlroots code changes are not NVIDIA specific and should benefit AMD and Intel combinations too for their discrete graphics.īy allowing the direct scan-out of full-screen surfaces from secondary GPUs, this should benefit full-screen games launched on laptops with the discrete GPU to deliver better performance / lower overhead. The intended use-case is for NVIDIA Optimus laptops where the primary GPU may be integrated CPU graphics but with a secondary discrete NVIDIA GPU. NVIDIA engineer Austin Shafer opened up a wlroots merge request to support scanning out of full-screen surfaces from secondary GPUs. A NVIDIA engineer has opened up a merge request to improve the wlroots Wayland library so compositors based on it can enjoy better gaming performance for dual-GPU systems, namely around laptops sporting a discrete NVIDIA GPU but can help other GPU hardware/drivers too.

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