Personal NixOS configuration using flakes and Home Manager for a Lenovo ThinkPad with AMD Ryzen AI 7 PRO 350 (Strix Point) and Radeon 860M graphics. This configuration features modular design, AMD GPU optimizations, and the COSMIC desktop environment.

This configuration is optimized for the following hardware:

Note: This is a Ryzen AI 300 series laptop (Strix Point architecture). The AMD optimizations in this config are specifically tuned for this hardware platform.

• Desktop Environment: COSMIC with cosmic-greeter
• Kernel: Latest Linux kernel (6.18+) with AMD-specific optimizations
• Shell: Zsh with powerlevel10k theme
• Editor: Neovim (default) + VSCode
• Terminal: Alacritty with Wayland support

The configuration is split into focused modules for maintainability:

• amd-optimization.nix: GPU/CPU optimizations, TLP power management, hardware acceleration
• desktop.nix: COSMIC desktop, keyboard layouts, Bluetooth, GNOME Keyring integration
• flatpak.nix: Declarative Flatpak management with auto-updates

Uses both stable (25.05) and unstable nixpkgs channels:

• Most packages from stable for reliability
• Select packages (e.g., netbird) from unstable for latest features

Includes a development shell with hardware diagnostics tools:

nix develop .#dev-tools

Provides: lspci, glxinfo, vulkaninfo, stress-ng, and more.

• NixOS installed with flakes enabled
• Git configured with authentication

# Clone the repository
git clone https://github.com/yourusername/nixos-config.git ~/nixos-config
cd ~/nixos-config

# Review and modify configuration files
# Update hardware-configuration.nix for your hardware:
sudo nixos-generate-config --show-hardware-config > hardware-configuration.nix

# Set up secrets (if using sops-nix)
# 1. Generate an age key:
age-keygen -o ~/.config/sops/age/keys.txt
# 2. Copy the public key and update secrets/secrets.yaml.example
# 3. Create and encrypt your secrets file:
cp secrets/secrets.yaml.example secrets/secrets.yaml
# Edit with your actual tokens, then encrypt:
sops -e -i secrets/secrets.yaml

# Apply the configuration
sudo nixos-rebuild switch --flake ~/nixos-config

nixos-config/
├── flake.nix                    # Flake configuration and inputs
├── flake.lock                   # Locked dependency versions
├── configuration.nix            # System-level configuration
├── home.nix                     # User environment (Home Manager)
├── hardware-configuration.nix   # Hardware-specific settings
├── modules/
│   ├── amd-optimization.nix     # AMD GPU/CPU optimizations
│   ├── desktop.nix              # Desktop environment setup
│   └── flatpak.nix              # Flatpak package management
├── secrets/
│   ├── .keep                    # Ensures directory exists
│   └── secrets.yaml.example     # Template for encrypted secrets
└── CLAUDE.md                    # AI assistant instructions

# Update flake inputs
nix flake update

# Apply system changes
sudo nixos-rebuild switch --flake ~/nixos-config

# Or use the custom alias (if shell already configured)
update

System packages (configuration.nix):

environment.systemPackages = with pkgs; [
  your-package
];

User packages (home.nix):

home.packages = with pkgs; [
  your-package
];

Unstable packages:

# Use pkgs-unstable instead of pkgs
package = pkgs-unstable.your-package;

Flatpak applications (modules/flatpak.nix):

packages = [
  "com.example.App"
];

# Test without making default
sudo nixos-rebuild test --flake ~/nixos-config

# Build for next boot only
sudo nixos-rebuild boot --flake ~/nixos-config

The configuration includes several kernel parameters for GPU stability on Strix Point. Currently active parameters:

• GPU recovery enabled: amdgpu.gpu_recovery=1
• CWSR disabled: amdgpu.cwsr_enable=0 (fixes Gentoo bug #967078)
• VPE disabled via IP block mask: amdgpu.ip_block_mask=0xfffff7ff (fixes VPE queue reset failures)
• IOMMU in passthrough mode: iommu=pt
• AMD P-State active governor: amd_pstate=active

Optional parameters (currently commented out in modules/amd-optimization.nix):

• Disable runtime PM if suspend/resume issues occur: amdgpu.runpm=0
• Disable GFX power saving if freezes during idle: amdgpu.gfx_off=0
• Disable PSR if screen flickering with external displays: amdgpu.dcdebugmask=0x10

If you experience specific GPU issues, you can uncomment the relevant optional parameters in modules/amd-optimization.nix.

See modules/amd-optimization.nix for complete configuration and detailed comments.

Git credentials managed via:

• libsecret credential helper
• GNOME Keyring (unlocked via PAM at login)
• Seahorse for GUI keyring management

• TLP instead of power-profiles-daemon
• Separate profiles for AC and battery power
• PCIe ASPM forced to performance mode

Hardware diagnostics and stress testing:

nix develop .#dev-tools

Includes: lspci, glxinfo, vulkaninfo, nvtop, stress-ng, s-tui, mesa-demos

• nixpkgs: NixOS 25.05 stable channel
• nixpkgs-unstable: Latest packages
• home-manager: User environment management
• zen-browser: Privacy-focused browser
• oh-my-tmux: Tmux configuration framework
• solaar: Logitech device manager
• nix-flatpak: Declarative Flatpak management
• sops-nix: Secrets management with age encryption

This is a personal configuration tailored to my specific hardware and workflow. While you're welcome to fork and adapt it for your own use, please note:

• This repo is not accepting pull requests
• Hardware-specific optimizations may not apply to your system
• Always review and test configurations before applying
• The hardware-configuration.nix is specific to my machine
• Secrets are managed with sops-nix and gitignored (use the template to create your own)

• NixOS: 25.05
• Home Manager: 25.05

Important: Do not change state versions without reading the NixOS manual section on state version migration.

• NixOS Manual
• Home Manager Manual
• Nix Flakes Documentation
• COSMIC Desktop
• sops-nix Documentation