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chore(aquamarine): use NixOS's NPU module with nixos-unstable-small (#527)
* chore(aquamarine): take the NPU stack from nixos-unstable-small * refactor(aquamarine): load the NPU driver via hardware.cpu.intel.npu Assisted-by: DeepSeek Harness (claude-opus-5-5)
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@@ -16,14 +16,14 @@ obsolete workarounds get rolled back instead of lingering.
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A version or revision pinned for a reason that can go away.
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| ID | What & where | Why | Removal condition | Added | Revisit | Status |
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| ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------- | ---------- | -------------------------- | ------ |
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| WA-004 | `catppuccin` on `main` — `flake.nix` | `main` carries the nodejs→nodejs-slim deprecation fix, which is not in a release | Switch to a release tag once it includes the fix | 2026-09-25 | on catppuccin release | active |
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| WA-006 | `nixpkgs-blender` — `flake.nix` | Blender 5.2 LTS + CUDA/OptiX pin; keeps `just up` from triggering a full source rebuild | Bump deliberately when needed; drop the pin if the current nixpkgs build is acceptable | 2026-07-24 | deliberate | active |
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| WA-020 | `fcitx5-vinput` pinned to release tag `v2.4.2` — `flake.nix`; consumer `home/linux/gui/base/vinput/default.nix` | Tracks a release tag instead of a branch, so `just up` stays on that release | Bump to a newer release tag when its changes are wanted | 2026-10-04 | on vinput release | active |
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| WA-021 | `nix-x86-on-aarch64` input — our fork of rowanG077's patched FEX + muvm runtime — `flake.nix`; `hosts/12kingdoms-shoukei/game/` | FEX does not support 16K pages, so x86/x86_64 apps and games on shoukei need this pinned flake's 4K-page microVM runtime; our fork lets upstream changes be reviewed before use | Drop once FEX supports 16K pages directly, or nixpkgs/nixos-apple-silicon ships an equivalent runtime | 2026-10-07 | on FEX/nixpkgs/muvm update | active |
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| WA-023 | `nix.package = pkgs.nixVersions.latest` — `modules/nixos/base/nix.nix` | NixOS is opted into Nix 2.35 (2.35.3), which nixpkgs ships as `nixVersions.latest`, while `nixVersions.stable` is still 2.34 (2.34.9) | Drop the override and fall back to the default `pkgs.nix` once `nixVersions.stable` is 2.35 or newer | 2026-10-07 | eval warning | active |
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| WA-037 | `nixpkgs-npu` input pinned to `2ddccb854d89` — the `openvino-npu-compiler` branch of `ryan4yin/nixpkgs`, carrying [NixOS/nixpkgs#570230](https://github.com/NixOS/nixpkgs/pull/570230) — `flake.nix`; consumer `pkgs-npu` in `outputs/default.nix`, `hosts/idols-aquamarine/asr.nix` | The Intel NPU compiler, and the driver change that loads it, are unmerged, so the NPU driver the Whisper service needs comes from that branch | Drop the input and load `intel-npu-driver` from `nixos-unstable` once #570230 merges | 2026-10-17 | when #570230 merges | active |
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| ID | What & where | Why | Removal condition | Added | Revisit | Status |
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| ------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------- | ---------- | ------------------------------------- | ------ |
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| WA-004 | `catppuccin` on `main` — `flake.nix` | `main` carries the nodejs→nodejs-slim deprecation fix, which is not in a release | Switch to a release tag once it includes the fix | 2026-09-25 | on catppuccin release | active |
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| WA-006 | `nixpkgs-blender` — `flake.nix` | Blender 5.2 LTS + CUDA/OptiX pin; keeps `just up` from triggering a full source rebuild | Bump deliberately when needed; drop the pin if the current nixpkgs build is acceptable | 2026-07-24 | deliberate | active |
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| WA-020 | `fcitx5-vinput` pinned to release tag `v2.4.2` — `flake.nix`; consumer `home/linux/gui/base/vinput/default.nix` | Tracks a release tag instead of a branch, so `just up` stays on that release | Bump to a newer release tag when its changes are wanted | 2026-10-04 | on vinput release | active |
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| WA-021 | `nix-x86-on-aarch64` input — our fork of rowanG077's patched FEX + muvm runtime — `flake.nix`; `hosts/12kingdoms-shoukei/game/` | FEX does not support 16K pages, so x86/x86_64 apps and games on shoukei need this pinned flake's 4K-page microVM runtime; our fork lets upstream changes be reviewed before use | Drop once FEX supports 16K pages directly, or nixpkgs/nixos-apple-silicon ships an equivalent runtime | 2026-10-07 | on FEX/nixpkgs/muvm update | active |
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| WA-023 | `nix.package = pkgs.nixVersions.latest` — `modules/nixos/base/nix.nix` | NixOS is opted into Nix 2.35 (2.35.3), which nixpkgs ships as `nixVersions.latest`, while `nixVersions.stable` is still 2.34 (2.34.9) | Drop the override and fall back to the default `pkgs.nix` once `nixVersions.stable` is 2.35 or newer | 2026-10-07 | eval warning | active |
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| WA-037 | `nixpkgs-small` input on `nixos-unstable-small`, which carries [NixOS/nixpkgs#570230](https://github.com/NixOS/nixpkgs/pull/570230) — `flake.nix`; consumer `pkgs-small` in `outputs/default.nix`, the `intel-npu-driver` overlay in `hosts/idols-aquamarine/hardware-intel-cpu.nix`, and the Python env in `hosts/idols-aquamarine/asr.nix` | The Intel NPU compiler, and the driver change that loads it, are not in `nixos-unstable` yet; `openvino-genai` 2026.4.0.0 failed to build there | Drop the overlay once #570230 reaches `nixos-unstable`; drop the input once `openvino-genai` also builds there | 2026-10-17 | when #570230 reaches `nixos-unstable` | active |
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## Workarounds
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