export-gpu: optionally pick the display GPU (GAMESCOPE_PREFER_DRM) for render/scanout split#114
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relil wants to merge 1 commit into
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export-gpu: optionally pick the display GPU (GAMESCOPE_PREFER_DRM) for render/scanout split#114relil wants to merge 1 commit into
relil wants to merge 1 commit into
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After choosing the render GPU (VULKAN_ADAPTER), offer to pin the DRM/KMS scanout device to the GPU the monitor is connected to, writing GAMESCOPE_PREFER_DRM to ~/.config/environment.d/. This enables a render/scanout split — gamescope renders the UI + games on the fast/headless GPU and scans out through the display GPU (hybrid / eGPU / muxless) — with no per-game launch options. Additive and opt-in: auto-detects cards with a connected output, prompts, and does nothing if skipped (default behaviour unchanged). Requires a gamescope built with --prefer-drm, which reads $GAMESCOPE_PREFER_DRM (ValveSoftware/gamescope#2220, bazzite-org/gamescope#11).
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Extends
export-gpuso a render/scanout split is fully configurable from the same helper.Today
export-gpuwritesVULKAN_ADAPTER(the render GPU). This adds an optional step: after that, it detects the GPU(s) with a connected display, lets you pick one, and writesGAMESCOPE_PREFER_DRM=/dev/dri/by-path/…-cardto~/.config/environment.d/. gamescope then renders the UI + games onVULKAN_ADAPTER(e.g. a headless/fast dGPU) while scanning out through the display GPU — hybrid / eGPU / muxless setups that otherwise black-screen./dev/dri/by-path/…-cardpath (card numbers can swap between boots).Requires a gamescope built with
--prefer-drm, which reads$GAMESCOPE_PREFER_DRM:Tested on Bazzite + CachyOS Game Mode (Intel iGPU + AMD BC-160):
export-gpu→ BC-160 as render, Intel as scanout; gamescope composites on BC-160, outputs via Intel HDMI; Steam Big Picture + Cyberpunk 2077 work.