From 2c2d22409f4082ab8891fe118f7ec041e83175d4 Mon Sep 17 00:00:00 2001
From: Simon Guest <simon.guest@tesujimath.org>
Date: Wed, 3 May 2023 16:51:13 +1200
Subject: [PATCH] Add HP Elitebook 845g9

---
 README.md                       |  1 +
 flake.nix                       |  1 +
 hp/elitebook/845/g9/default.nix | 25 +++++++++++++++++++++++++
 3 files changed, 27 insertions(+)
 create mode 100644 hp/elitebook/845/g9/default.nix

diff --git a/README.md b/README.md
index eb9df53..ddc3c83 100644
--- a/README.md
+++ b/README.md
@@ -131,6 +131,7 @@ See code for all available configurations.
 | [GPD WIN 2](gpd/win-2)                                              | `<nixos-hardware/gpd/win-2>`                       |
 | [Google Pixelbook](google/pixelbook)                                | `<nixos-hardware/google/pixelbook>`                |
 | [HP Elitebook 2560p](hp/elitebook/2560p)                            | `<nixos-hardware/hp/elitebook/2560p>`              |
+| [HP Elitebook 845g9](hp/elitebook/845/g9)                           | `<nixos-hardware/hp/elitebook/845/g9>`             |
 | [i.MX8QuadMax Multisensory Enablement Kit](nxp/imx8qm-mek/)         | `<nixos-hardware/nxp/imx8qm-mek>`                  |
 | [Intel NUC 8i7BEH](intel/nuc/8i7beh/)                               | `<nixos-hardware/intel/nuc/8i7beh>`                |
 | [Lenovo IdeaPad Gaming 3 15arh05](lenovo/ideapad/15arh05)           | `<nixos-hardware/lenovo/ideapad/15arh05>`          |
diff --git a/flake.nix b/flake.nix
index c6348dc..0992f3a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -65,6 +65,7 @@
       gpd-pocket-3 = import ./gpd/pocket-3;
       gpd-win-2 = import ./gpd/win-2;
       hp-elitebook-2560p = import ./hp/elitebook/2560p;
+      hp-elitebook-845g9 = import ./hp/elitebook/845/g9;
       intel-nuc-8i7beh = import ./intel/nuc/8i7beh;
       lenovo-ideapad-15arh05 = import ./lenovo/ideapad/15arh05;
       lenovo-ideapad-z510 = import ./lenovo/ideapad/z510;
diff --git a/hp/elitebook/845/g9/default.nix b/hp/elitebook/845/g9/default.nix
new file mode 100644
index 0000000..0bdcd67
--- /dev/null
+++ b/hp/elitebook/845/g9/default.nix
@@ -0,0 +1,25 @@
+{ config, pkgs, lib, ... }:
+
+{
+  imports =
+    [
+      ../../../../common/cpu/amd
+      ../../../../common/cpu/amd/pstate.nix
+      ../../../../common/gpu/amd
+      ../../../../common/pc/laptop
+      ../../../../common/pc/laptop/acpi_call.nix
+      ../../../../common/pc/laptop/ssd
+    ];
+
+  hardware.enableRedistributableFirmware = lib.mkDefault true;
+  boot.kernelModules = [ "synaptics_usb" ];
+  boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux_latest;
+
+  # disable Scatter/Gather APU recently enabled by default,
+  # which results in white screen after display reconfiguration
+  boot.kernelParams = [ "amdgpu.sg_display=0" ];
+
+  services.xserver = {
+    videoDrivers = [ "amdgpu" ];
+  };
+}