Just wanted to share something that may make someones life a bit easier
The unofficial wiki tells you to add the following to turn off the dGPU (see here)
boot.extraModprobeConfig = ''
blacklist nouveau
options nouveau modeset=0
'';
services.udev.extraRules = ''
# Remove NVIDIA USB xHCI Host Controller devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x0c0330", ATTR{power/control}="auto", ATTR{remove}="1"
# Remove NVIDIA USB Type-C UCSI devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x0c8000", ATTR{power/control}="auto", ATTR{remove}="1"
# Remove NVIDIA Audio devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x040300", ATTR{power/control}="auto", ATTR{remove}="1"
# Remove NVIDIA VGA/3D controller devices
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x03[0-9]*", ATTR{power/control}="auto", ATTR{remove}="1"
'';
boot.blacklistedKernelModules = [ "nouveau" "nvidia" "nvidia_drm" "nvidia_modeset" ];
but this did not work for me ( xorg would crash upon login and return me back to gdm)
i also had to add the following line to make it work
services.xserver.videoDrivers = ["nvidia" "modesetting"];
Specializations can also be used to make switching easy! Heres my config
specialisation = {
on-the-go.configuration = {
system.nixos.tags = ["on-the-go"];
hardware.nvidia = {
prime.offload.enable = lib.mkForce true;
prime.offload.enableOffloadCmd = lib.mkForce true;
prime.sync.enable = lib.mkForce false;
};
};
battery-saver.configuration = {
system.nixos.tags = ["battery-saver"];
services.xserver.videoDrivers = lib.mkForce ["nvidia" "modesetting"];
boot.extraModprobeConfig = ''
blacklist nouveau
options nouveau modeset=0
'';
services.udev.extraRules = ''
# Remove NVIDIA USB xHCI Host Controller devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x0c0330", ATTR{power/control}="auto", ATTR{remove}="1"
# Remove NVIDIA USB Type-C UCSI devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x0c8000", ATTR{power/control}="auto", ATTR{remove}="1"
# Remove NVIDIA Audio devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x040300", ATTR{power/control}="auto", ATTR{remove}="1"
# Remove NVIDIA VGA/3D controller devices
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x03[0-9]*", ATTR{power/control}="auto", ATTR{remove}="1"
'';
boot.blacklistedKernelModules = ["nouveau" "nvidia" "nvidia_drm" "nvidia_modeset"];
systemd.services.nbfc_service.enable = lib.mkForce false;
};
};
Full config file for nvidia can be seen here