From 3d3d29a83c3883d17139cceda5e7a081d03fea5a Mon Sep 17 00:00:00 2001
From: Sean Buckley <sean.bck@gmail.com>
Date: Mon, 4 Nov 2024 20:54:18 -0500
Subject: [PATCH] move GPU notes

---
 hosts/levi/gpu_notes.txt | 62 ++++++++++++++++++++++++++++++++++++
 hosts/levi/xorg.nix      | 69 ----------------------------------------
 2 files changed, 62 insertions(+), 69 deletions(-)
 create mode 100644 hosts/levi/gpu_notes.txt

diff --git a/hosts/levi/gpu_notes.txt b/hosts/levi/gpu_notes.txt
new file mode 100644
index 0000000..0cab21a
--- /dev/null
+++ b/hosts/levi/gpu_notes.txt
@@ -0,0 +1,62 @@
+{
+hardware.nvidia.prime.intelBusId = "PCI:0:2:0";
+hardware.nvidia.prime.nvidiaBusId = "PCI:1:0:0";
+}
+
+### Nothing here has been tested since 2022
+
+################################################################################
+
+### "sync mode"
+#
+# good:
+#   max performance on external displays
+#   no BIOS settings change needed
+#
+# bad:
+#   graphics performance overhead on internal display
+#   internal display capped at 60hz
+#
+# hardware.nvidia.prime.sync.enable = true;
+# hardware.nvidia.modesetting.enable = true;
+# services.xserver.displayManager.gdm.wayland = false;
+# services.xserver.videoDrivers = [ "nvidia" ];
+# # xrandr workaround for laptop panel not showing up with GDM. Reference:
+# # https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/hardware/video/nvidia.nix
+# services.xserver.displayManager.sessionCommands = ''
+#   ${pkgs.xorg.xrandr}/bin/xrandr --setprovideroutputsource modesetting NVIDIA-0
+# '';
+
+################################################################################
+
+### nvidia drivers disabled
+#
+# Not well tested. Possibly Incomplete.
+# Won't allow external displays connected to nvidia GPU.
+#
+# Shutting off Nvidia GPU would theoretically save power.
+# I do not think this actually powers down the Nvidia GPU, just stops using it.
+#
+# boot.kernelParams = [ "module_blacklist=nouveau" ];
+
+################################################################################
+
+### hybrid graphics
+#
+# Not well tested. Possibly Incomplete.
+# Won't allow external displays connected to nvidia GPU.
+#
+# Everything would use intel by default,
+# but specific apps would run on the nvidia GPU under the script.
+#
+# hardware.nvidia.prime.offload.enable = true;
+# services.xserver.videoDrivers = [ "nvidia" ];
+# environment.systemPackages = [
+#   (pkgs.writeShellScriptBin "nv" ''
+#     export __NV_PRIME_RENDER_OFFLOAD=1
+#     export __NV_PRIME_RENDER_OFFLOAD_PROVIDER=NVIDIA-G0
+#     export __GLX_VENDOR_LIBRARY_NAME=nvidia
+#     export __VK_LAYER_NV_optimus=NVIDIA_only
+#     exec "$@"
+#   '')
+# ];
diff --git a/hosts/levi/xorg.nix b/hosts/levi/xorg.nix
index 55ab324..56633ec 100644
--- a/hosts/levi/xorg.nix
+++ b/hosts/levi/xorg.nix
@@ -1,16 +1,5 @@
 {
-  hardware.nvidia.prime.intelBusId = "PCI:0:2:0";
-  hardware.nvidia.prime.nvidiaBusId = "PCI:1:0:0";
-
   ### NVIDIA-only using MUX switch in BIOS.
-  #
-  # good:
-  #   simple, always works.
-  #   max performance everywhere.
-  #
-  # bad:
-  #   requires BIOS setting changes, which is annoying.
-  #
   boot.kernelParams = [ "module_blacklist=i915" ];
   services.xserver.displayManager.gdm.wayland = false;
   services.xserver.videoDrivers = [ "nvidia" ];
@@ -19,61 +8,3 @@
     Option "metamodes" "DP-2: 2560x1440_165 +0+0 {AllowGSYNCCompatible=On}"
   '';
 }
-
-### Nothing below this line has been tested since 2022
-
-################################################################################
-
-### "sync mode"
-#
-# good:
-#   max performance on external displays
-#   no BIOS settings change needed
-#
-# bad:
-#   graphics performance overhead on internal display
-#   internal display capped at 60hz
-#
-# hardware.nvidia.prime.sync.enable = true;
-# hardware.nvidia.modesetting.enable = true;
-# services.xserver.displayManager.gdm.wayland = false;
-# services.xserver.videoDrivers = [ "nvidia" ];
-# # xrandr workaround for laptop panel not showing up with GDM. Reference:
-# # https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/hardware/video/nvidia.nix
-# services.xserver.displayManager.sessionCommands = ''
-#   ${pkgs.xorg.xrandr}/bin/xrandr --setprovideroutputsource modesetting NVIDIA-0
-# '';
-
-################################################################################
-
-### nvidia drivers disabled
-#
-# Not well tested. Possibly Incomplete.
-# Won't allow external displays connected to nvidia GPU.
-#
-# Shutting off Nvidia GPU would theoretically save power.
-# I do not think this actually powers down the Nvidia GPU, just stops using it.
-#
-# boot.kernelParams = [ "module_blacklist=nouveau" ];
-
-################################################################################
-
-### hybrid graphics
-#
-# Not well tested. Possibly Incomplete.
-# Won't allow external displays connected to nvidia GPU.
-#
-# Everything would use intel by default,
-# but specific apps would run on the nvidia GPU under the script.
-#
-# hardware.nvidia.prime.offload.enable = true;
-# services.xserver.videoDrivers = [ "nvidia" ];
-# environment.systemPackages = [
-#   (pkgs.writeShellScriptBin "nv" ''
-#     export __NV_PRIME_RENDER_OFFLOAD=1
-#     export __NV_PRIME_RENDER_OFFLOAD_PROVIDER=NVIDIA-G0
-#     export __GLX_VENDOR_LIBRARY_NAME=nvidia
-#     export __VK_LAYER_NV_optimus=NVIDIA_only
-#     exec "$@"
-#   '')
-# ];