Emma Thorpe
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The stock GPU has been replaced with a Quadro P400 (Pascal, GP108). Add hosts/MacPro31/nvidia.nix: - Driver branch 580 (nvidiaPackages.legacy_580), not the nixpkgs default production branch (595.x). 580 is the last branch supporting Maxwell/Pascal/Volta and is an LTS branch until Aug 2028; a newer one does not drive this card. - modesetting.enable for Wayland (nvidia-drm.modeset=1), open = false (the open kernel modules need Turing or later), and sway --unsupported-gpu, which wlroots requires with the proprietary driver. - Docker with GPU access via CDI (hardware.nvidia-container-toolkit), rather than the deprecated virtualisation.docker.enableNvidia runtime wrapper. Containers run with --device=nvidia.com/gpu=all and must ship a CUDA 12.x or older runtime: CUDA 13 dropped sm_61. The driver packages are unfree, so allowlist them in unfreePackages; they are not cached and the kernel module builds on the host. Also declare features.cpu.microarchLevel = 1 for this machine: the Harpertown Xeons have SSE4.1 but no SSE4.2/POPCNT, which switches off Claude Code through the fleet-wide gate.