macbook-air-6: remove mba6x_bl kernel module

[DanielSiepmann]

This does not compile against 6.x Kernel.
This is also no longer necessary for 6.x Kernel.
One can use "acpi_video0" device instead of "mba6x_backlight" device.

Description of changes

Remove mba6x_backlight kernel module.

Things done

• Tested the changes in your own NixOS Configuration
• Tested the changes end-to-end by using your fork of nixos-hardware and
  importing it via <nixos-hardware> or Flake input

[DanielSiepmann]

Should solve: #648
Feel free to provide feedback or modify.
Better would be to somehow add a check for the kernel version and only add for kernels < 6.1. But I'm still a beginner and don't know how to do that.

[DanielSiepmann]

I've tried the following but that doesn't work:

diff --git a/apple/macbook-air/6/default.nix b/apple/macbook-air/6/default.nix
index c892026..f810211 100644
--- a/apple/macbook-air/6/default.nix
+++ b/apple/macbook-air/6/default.nix
@@ -1,14 +1,22 @@
-{ config, lib, ... }:
+{ config, pkgs, lib, ... }:
 
 {
   imports = [ ../. ];
 
-  boot = {
-    # Divides power consumption by two.
-    kernelParams = [ "acpi_osi=" ];
-  };
+  boot = lib.mkMerge [
+    (lib.mkIf (lib.versionOlder pkgs.linux.version "6.1") {
+      extraModulePackages = with config.boot.kernelPackages; [ mba6x_bl ];
+      kernelModules = "mba6x_bl";
+    })
 
-  services.xserver.deviceSection = lib.mkDefault ''
+    {
+      # Divides power consumption by two.
+      kernelParams = [ "acpi_osi=" ];
+    }
+  ];
+
+  services.xserver.deviceSection = lib.mkDefault (
+    (lib.mkIf (lib.versionOlder pkgs.linux.version "6.1") "Option \"Backlight\" \"mba6x_backlight\"") + ''
     Option "TearFree" "true"
-  '';
+  '');
 }

[Mic92]

Let's get rid of old stuff:

bors merge

[bors]

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• tests