homepage fixes and flake up

hosts/kima/modules.nix

@@ -4,7 +4,7 @@
       kernel = {
         variant = "latest";
         hardware = ["amd"];
-        extraKernelParams = [];
+        extraKernelParams = ["amdgpu.dcdebugmask=0x10"];
       };
       loader = {
         default = {

hosts/kima/settings.nix

@@ -35,8 +35,9 @@
     ];
     theme = {
       background = {
-        lockscreen = "wallpaper_2";
+        lockscreen = "wallpaper_4";
         desktop = "wallpaper_1";
+        vertical = "wallpaper_5";
       };
     };
   };