Hardware Profiles

The problem

GPU support is the messiest part of any Linux host config: drivers, kernel modules, acceleration stacks, user groups, and environment variables all have to agree. Three hosts with three different GPU vendors should not each reinvent this.

The solution

GPU stacks are abstracted into reusable hardware profiles under hosts/common/hardware-profiles/:

Profile	File	Used by
AMD	amd-gpu.nix	p620 (Radeon RX 7900, ROCm)
NVIDIA	nvidia-gpu.nix	p510, razer
Intel integrated	intel-integrated.nix	hybrid-graphics hosts

A host's variables.nix imports the right profile and inherits its gpu, acceleration, videoDrivers, extra user groups, and environment variables:

# hosts/p620/variables.nix
hardwareProfile = import ../common/hardware-profiles/amd-gpu.nix;
# …
gpu          = hardwareProfile.gpu;
acceleration = hardwareProfile.acceleration;
userGroups   = baseUserGroups ++ (hardwareProfile.extraGroups or [ ]);

Why this matters per host

p620 (AMD)

Radeon RX 7900 with the amdgpu driver and ROCm acceleration — this is what makes p620 viable as the local Ollama inference host. The profile adds the render/video groups and the ROCm environment so the GPU is usable from containers and CLI tools.

p510 (NVIDIA)

Intel Xeon paired with an NVIDIA card. The profile pulls in the proprietary driver and the bits needed for hardware transcoding in Plex.

razer (NVIDIA + Intel)

Hybrid Optimus graphics: the Intel iGPU drives the panel for battery life, the NVIDIA dGPU is available on demand. The profile handles the dual-driver setup; the laptop profile adds power management on top.

Source

The exact contents of each profile — driver lists, groups, env vars — are in the generated Host Manifests under hosts/common/.