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fix: complete hybridGPU wiring + make state-derived options overridable

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Two related fixes that together close the "minimal wiring" gap behind
`nomarchy.system.features.hybridGPU`.

1. Complete the NVIDIA driver stack inside hardware.nix's hybridGPU
   mkIf block.

   Before: `hybridGPU = true` enabled supergfxd and... that was it.
   supergfxd manages mode switching by black/unblacklisting the nvidia
   kernel module, but without the rest of the NVIDIA stack actually
   loaded the dGPU has no driver to drive. Hyprland/Wayland silently
   stayed on the iGPU regardless of mode.

   After: hybridGPU=true also wires
     services.xserver.videoDrivers = ["nvidia"]   (loads the driver
                                                   under Wayland too)
     hardware.graphics.{enable,enable32Bit}
     hardware.nvidia.modesetting.enable           (required for
                                                   Wayland)
     hardware.nvidia.powerManagement.enable
     hardware.nvidia.package = config.boot.kernelPackages
                                      .nvidiaPackages.stable
     boot.kernelParams += "nvidia-drm.modeset=1"

   All wired with lib.mkDefault so a downstream system.nix can pin a
   beta driver, flip to the open kernel module, or set
   `hardware.nvidia.prime.{offload.enable, intelBusId, nvidiaBusId}`
   for render-offload. The bus IDs are per-machine (find via
   `lspci -D`) so they stay user-supplied; docs/OPTIONS.md has the
   full recipe.

2. Add lib.mkDefault to every state.json-derived assignment in
   core/system/state.nix and core/home/state.nix.

   Same priority bug on both sides: assignments like
   `features.hybridGPU = systemState.features.hybridGPU or false`
   landed at default priority. A downstream system.nix saying
   `nomarchy.system.features.hybridGPU = true` would then conflict
   with the state-derived value at the same priority, and Nix would
   refuse the merge with "conflicting definition values" — the
   user's override couldn't take effect.

   Verified by an explicit eval: extending the default nixosConfig
   with `nomarchy.system.features.hybridGPU = true` now resolves
   cleanly and the full driver stack engages.

   Side-effect: core/system/state.nix now reads from
   lib/state-schema.nix like the home side does, completing the
   schema-centralization started two batches ago.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Bernardo Magri
2026-05-18 18:12:09 +01:00
parent 9c672953bc
commit d264371b46
5 changed files with 99 additions and 28 deletions
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39
core/system/hardware.nix
View File

@@ -70,8 +70,47 @@ in
})
(mkIf config.nomarchy.system.features.hybridGPU {
# supergfxd manages mode switching (Integrated / Hybrid / Vfio /
# AsusEgpu). It blacklists/unblacklists the nvidia kernel module via
# /etc/modprobe.d/ depending on the active mode. ExecStartPre sleep
# gives udev time to settle so the daemon doesn't see a half-attached
# GPU on cold boot.
services.supergfxd.enable = true;
systemd.services.supergfxd.serviceConfig.ExecStartPre = "-${pkgs.coreutils}/bin/sleep 5";
# Load the NVIDIA driver so the dGPU has something to drive. Without
# these, supergfxd switches modes successfully but the X/Wayland
# stack has no NVIDIA driver loaded — render-offload silently no-ops
# and Hyprland renders everything on the iGPU regardless of mode.
# mkDefault throughout so downstream system.nix can override
# (pin to a beta driver, flip to the open kernel module, etc.).
services.xserver.videoDrivers = lib.mkDefault [ "nvidia" ];
hardware.graphics.enable = lib.mkDefault true;
hardware.graphics.enable32Bit = lib.mkDefault true;
hardware.nvidia = {
modesetting.enable = lib.mkDefault true;
powerManagement.enable = lib.mkDefault true;
open = lib.mkDefault false;
package = lib.mkDefault config.boot.kernelPackages.nvidiaPackages.stable;
};
# Required for Wayland compositors (Hyprland) to render via NVIDIA.
boot.kernelParams = [ "nvidia-drm.modeset=1" ];
# PRIME render-offload (the part that lets `nvidia-offload <cmd>`
# actually use the dGPU) needs bus IDs, which are per-machine.
# We deliberately don't enable `hardware.nvidia.prime.offload.enable`
# here — without the correct intelBusId / nvidiaBusId the nvidia
# kernel module panics on load. The user adds this to their own
# /etc/nixos/system.nix after running `lspci -D`:
#
# hardware.nvidia.prime = {
# offload.enable = true;
# offload.enableOffloadCmd = true;
# intelBusId = "PCI:0:2:0"; # or amdgpuBusId for AMD iGPU
# nvidiaBusId = "PCI:1:0:0";
# };
#
# See docs/OPTIONS.md for the full recipe.
})
];
}

25
core/system/state.nix
View File

@@ -2,19 +2,28 @@
let
nomarchyLib = import ../../lib { inherit lib; };
# Same canonical schema as core/home/state.nix and the options.nix
# files — keeps every state default in one place.
schema = import ../../lib/state-schema.nix { inherit lib; };
systemState = nomarchyLib.readSystemState;
in
{
# Every assignment is lib.mkDefault so a downstream /etc/nixos/system.nix
# can still set e.g. `nomarchy.system.features.hybridGPU = true;`
# without colliding with the state.json-derived value. Without
# mkDefault, every state.json-driven option was unoverridable from
# Nix — flipping hybridGPU required jq'ing the state file rather
# than declaring it in your config.
config.nomarchy.system = {
dns = systemState.dns or "DHCP";
customDns = systemState.customDns or [];
wifi.powersave = systemState.wifi.powersave or true;
timezone = systemState.timezone or "UTC";
dns = lib.mkDefault (systemState.dns or schema.system.dns);
customDns = lib.mkDefault (systemState.customDns or schema.system.customDns);
wifi.powersave = lib.mkDefault (systemState.wifi.powersave or schema.system.wifi.powersave);
timezone = lib.mkDefault (systemState.timezone or schema.system.timezone);
features = {
fingerprint = systemState.features.fingerprint or false;
fido2 = systemState.features.fido2 or false;
hybridGPU = systemState.features.hybridGPU or false;
fingerprint = lib.mkDefault (systemState.features.fingerprint or schema.system.features.fingerprint);
fido2 = lib.mkDefault (systemState.features.fido2 or schema.system.features.fido2);
hybridGPU = lib.mkDefault (systemState.features.hybridGPU or schema.system.features.hybridGPU);
};
theme = systemState.theme or "nord";
theme = lib.mkDefault (systemState.theme or schema.system.theme);
};
}