Disable capslock with udev (#786)

* Disable capslock remapper in xremap

* Disable capslock with udev with specifying the device names

* Don't depend on broken services.udev.extraHwdb

nixos/hardware.nix

@@ -0,0 +1,30 @@
+{ ... }:
+{
+  # services.udev = {
+  #   enable = true;
+  #   # Settings keyremap in raw layer than X. See GH-784
+
+  #   # Specify hardware names even if `evdev:input:*` working for mostcase
+  #   extraHwdb = ''
+  #     evdev:name:Topre REALFORCE 87 US:*
+  #       # original: capslock
+  #       KEYBOARD_KEY_70039=leftctrl
+  #   '';
+  # };
+
+  # Settings keyremap in raw layer than X. See GH-784
+  # Don't use `services.udev.extraHwdb`, it does not create the file at least in NixOS 24.05
+  # See https://github.com/NixOS/nixpkgs/issues/182966 for detail
+  #
+  # - Specify hardware names even if `evdev:input:*` working for mostcase. I should care both US and JIS layout
+  # - How to get the KEYBOARD_KEY_700??: `showkey --scancodes` in VT
+  # - How to get the hardware name:: `udevadm info --attribute-walk /dev/input/event?? | grep -F 'ATTRS{name}'`
+  # - How to apply?: After nixos-rebuild switch `sudo systemd-hwdb update && sudo udevadm trigger`
+  environment.etc."udev/hwdb.d/99-local.hwdb".text = ''
+    evdev:name:Topre REALFORCE 87 US:*
+      KEYBOARD_KEY_70039=leftctrl # original: capslock
+
+    evdev:name:Lenovo ThinkPad Compact USB Keyboard with TrackPoint:* # Both US and JIS have same name
+      KEYBOARD_KEY_70039=leftctrl # original: capslock, Both US and JIS have same keycode for capslock
+  '';
+}

nixos/hosts/algae/default.nix

@@ -6,6 +6,7 @@
   imports = [
     ../../configuration.nix
     ../../gui.nix
+    ../../hardware.nix
 
     ./hardware-configuration.nix
 

nixos/hosts/moss/default.nix

@@ -6,6 +6,7 @@
   imports = [
     ../../configuration.nix
     ../../gui.nix
+    ../../hardware.nix
 
     ./hardware-configuration.nix
     ./fingerprint.nix

nixos/xremap.nix

@@ -23,7 +23,7 @@
         {
           name = "Global";
           remap = {
-            "CapsLock" = "Ctrl_L";
+            # "CapsLock" = "Ctrl_L"; # Avoid using xremap to kill capslock for stability. See GH-784
             "Alt_L" = {
               "held" = "Alt_L";
               "alone" = "Muhenkan";