panasonic: add Let's Note CF-LX3 configuration

Author: yvan-sraka

README.md

@@ -377,6 +377,7 @@ See code for all available configurations.
 | [Omen 15-en1007sa](omen/15-en1007sa)                                              | `<nixos-hardware/omen/15-en1007sa>`                     | `omen-15-en1007sa`                |
 | [Omen 15-en0002np](omen/15-en0002np)                                              | `<nixos-hardware/omen/15-en0002np>`                     | `omen-15-en0002np`                |
 | [One-Netbook OneNetbook 4](onenetbook/4)                                          | `<nixos-hardware/onenetbook/4>`                         | `onenetbook-4`                    |
+| [Panasonic Let's Note CF-LX3](panasonic/letsnote/cf-lx3)                          | `<nixos-hardware/panasonic/letsnote/cf-lx3>`            | `panasonic-letsnote-cf-lx3`       |
 | [Panasonic Let's Note CF-LX4](panasonic/letsnote/cf-lx4)                          | `<nixos-hardware/panasonic/letsnote/cf-lx4>`            | `panasonic-letsnote-cf-lx4`       |
 | [PC Engines APU](pcengines/apu)                                                   | `<nixos-hardware/pcengines/apu>`                        | `pcengines-apu`                   |
 | [PINE64 Pinebook Pro](pine64/pinebook-pro/)                                       | `<nixos-hardware/pine64/pinebook-pro>`                  | `pine64-pinebook-pro`             |

flake.nix

@@ -288,6 +288,7 @@
           lenovo-yoga-7-14IAH7-hybrid = import ./lenovo/yoga/7/14IAH7/hybrid;
           lenovo-yoga-7-14ILL10 = import ./lenovo/yoga/7/14ILL10;
           lenovo-yoga-7-slim-gen8 = import ./lenovo/yoga/7/slim/gen8;
+          letsnote-cf-lx3 = import ./panasonic/letsnote/cf-lx3;
           letsnote-cf-lx4 = import ./panasonic/letsnote/cf-lx4;
           malibal-aon-s1-intel = import ./malibal/aon/s1;
           microchip-icicle-kit = import ./microchip/icicle-kit;

panasonic/letsnote/cf-lx3/default.nix

@@ -0,0 +1,11 @@
+{
+  imports = [
+    ../../../common/cpu/intel
+    ../../../common/pc/laptop
+    ../../../common/pc/ssd
+  ];
+
+  # Force use of the intel_backlight driver for backlight control.
+  # This allows the backlight save/load systemd service to work.
+  boot.kernelParams = [ "acpi_backlight=video" ];
+}