finetune mouse acceleration

hosts/nixos/thinkpad/home.nix

@@ -15,6 +15,14 @@
     ../../../modules/papis.nix
   ];
 
+  # ThinkPad-specific GNOME dconf overrides
+  dconf.settings = {
+    "org/gnome/desktop/peripherals/mouse" = {
+      speed = 0.0;               # Match libinput accelSpeed for TrackPoint
+      accel-profile = "flat";    # Match libinput accelProfile (no acceleration)
+    };
+  };
+
   programs.yt-dlp-custom = {
     enable = true;
     downloadDir = "~/Downloads/web-video";

hosts/nixos/thinkpad/system.nix

@@ -111,6 +111,13 @@
     accelProfile = "adaptive";
   };
 
+  # TrackPoint configuration (treated as mouse device)
+  services.libinput.mouse = {
+    accelSpeed = "0.0";         # Higher sensitivity for trackpoint (-1.0 to 1.0)
+    accelProfile = "flat";      # No acceleration curve for precise control
+    middleEmulation = false;    # ThinkPad trackpoints have real middle buttons
+  };
+
   # Power management for laptops
   powerManagement = {
     enable = true;

modules/desktop.nix

@@ -72,7 +72,7 @@ in
       enable = true;
       touchpad = {
         naturalScrolling = true;
-        tapping = true;
+        tapping = false;
       };
     };
 

modules/gnome.nix

@@ -16,6 +16,12 @@ in
       cursor-theme = "Adwaita";
     };
 
+    # Touchpad settings
+    "org/gnome/desktop/peripherals/touchpad" = {
+      tap-to-click = false;
+      natural-scroll = true;
+    };
+
     # Desktop background
     "org/gnome/desktop/background" = {
       picture-uri = "file:///home/yanlin/Documents/Library/nixos-nineish-dark@4k.png";