dell-precision-5490: make force_probe conditional

dell/precision/5490/README.md

@@ -1,15 +1,15 @@
 # Dell Precision 5490
 
-The internal monitor needs Linux Kernel >= 6.7 so enabling hybrid graphics does not work out of the box in 24.05. Setting
+Linux kernel versions prior to 6.7 may not function correctly with the internal monitor, as official support was introduced in version 6.7 (https://www.phoronix.com/news/Linux-6.7-Intel-Meteor-Lake-Gfx). You can enable experimental support by adding the following parameter:
 
 ```
 boot.kernelParams = [ "i915.force_probe=7d55" ];
 ```
 
-helped but introduced some screen tearing.
+However, this may lead to some screen tearing.
 
-Setting
+If possible, you might benefit from a newer kernel, for example:
 ```
 boot.kernelPackages = pkgs.linuxPackages_latest;
 ```
-in nixos-stable worked with no problems.
+as it seems to work without any issues.

dell/precision/5490/default.nix

@@ -1,13 +1,11 @@
-{ lib, ... }:
+{ config, lib, ... }:
 {
   imports = [
-    ../../../common/gpu/nvidia
+    ../../../common/gpu/nvidia/ada-lovelace
   ];
 
-  # or even better: boot.kernelParams = pkgs.linuxPackages_latest;
-  boot.kernelParams = [ "i915.force_probe=7d55" ];
+  boot.kernelParams = lib.mkIf (lib.versionOlder config.boot.kernelPackages.kernel.version "6.7") [ "i915.force_probe=7d55" ];
 
-  hardware.nvidia.open = true;
   hardware.nvidia.prime = {
     intelBusId = "PCI:0:2:0";
     nvidiaBusId = "PCI:1:0:0";