feat: remove custom brightness settings

configuration.nix

@@ -1,95 +1,5 @@
 { config, pkgs, ... }:
 
-let
-  displayBrightness = pkgs.writeShellApplication {
-    name = "display-brightness";
-    runtimeInputs = with pkgs; [
-      brightnessctl
-      ddcutil
-      gawk
-    ];
-    text = ''
-      set -euo pipefail
-
-      direction="''${1:-}"
-      step="''${DISPLAY_BRIGHTNESS_STEP:-1}"
-      minimum="''${DISPLAY_BRIGHTNESS_MIN:-1}"
-
-      is_uint() {
-        case "$1" in
-          "" | *[!0-9]*)
-            return 1
-            ;;
-          *)
-            return 0
-            ;;
-        esac
-      }
-
-      if ! is_uint "$step" || [ "$step" -lt 1 ]; then
-        step=1
-      fi
-      if ! is_uint "$minimum"; then
-        minimum=1
-      fi
-
-      case "$direction" in
-        down)
-          backlight_delta="''${step}%-"
-          ;;
-        up)
-          backlight_delta="''${step}%+"
-          ;;
-        *)
-          printf 'usage: display-brightness up|down\n' >&2
-          exit 64
-          ;;
-      esac
-
-      brightnessctl --class=backlight --min-value set "$backlight_delta" >/dev/null 2>&1 || true
-
-      ddc_displays="$(
-        ddcutil --brief detect 2>/dev/null \
-          | awk '/^Display[[:space:]]+[0-9]+/ { print $2 }' \
-          || true
-      )"
-
-      for display in $ddc_displays; do
-        parsed="$(
-          ddcutil --brief --display "$display" getvcp 10 2>/dev/null \
-            | awk '$1 == "VCP" && $2 == "10" && NF >= 5 { print $(NF - 1), $NF; exit }' \
-            || true
-        )"
-        if [ -z "$parsed" ]; then
-          continue
-        fi
-
-        read -r current maximum _ <<EOF
-      $parsed
-      EOF
-
-        if ! is_uint "$current" || ! is_uint "$maximum" || [ "$maximum" -lt "$minimum" ]; then
-          continue
-        fi
-
-        if [ "$direction" = "down" ]; then
-          target=$((current - step))
-          if [ "$target" -lt "$minimum" ]; then
-            target="$minimum"
-          fi
-        else
-          target=$((current + step))
-          if [ "$target" -gt "$maximum" ]; then
-            target="$maximum"
-          fi
-        fi
-
-        ddcutil --display "$display" --sleep-multiplier 0.1 --maxtries 1,1,1 --noverify setvcp 10 "$target" >/dev/null 2>&1 || true
-      done
-    '';
-  };
-in
-
 {
   boot.loader.systemd-boot.enable = true;
   boot.loader.systemd-boot.configurationLimit = 3;
@@ -199,7 +109,6 @@ in
     enable = true;
     enable32Bit = true;
   };
-  hardware.i2c.enable = true;
 
   # Enable keyd for key remapping
   services.keyd = {
@@ -222,8 +131,8 @@ in
             brightnessdown = "noop"; # ← Key 7: disabled
             brightnessup = "noop"; # ← Key 8: disabled
             # Key 9: display toggle (leftmeta+p) - disabled below
-            rfkill = "command(${displayBrightness}/bin/display-brightness down)"; # ← Key 10: brightness down
-            sysrq = "command(${displayBrightness}/bin/display-brightness up)"; # ← Key 11: brightness up
+            rfkill = "brightnessdown"; # ← Key 10: brightness down
+            sysrq = "brightnessup"; # ← Key 11: brightness up
             media = "sysrq"; # ← Key 12: screenshot
           };
         };
@@ -234,7 +143,7 @@ in
           main = {
             brightnessdown = "noop"; # ← Key 7: disabled
             brightnessup = "noop"; # ← Key 8: disabled
-            rfkill = "command(${displayBrightness}/bin/display-brightness down)"; # ← Key 10: brightness down
+            rfkill = "brightnessdown"; # ← Key 10: brightness down
           };
         };
       };
@@ -418,7 +327,6 @@ in
       "wheel"
       "video"
       "render"
-      "i2c"
       "docker"
       "camera"
       "scanner"
@@ -500,21 +408,18 @@ in
     "net.ipv4.tcp_congestion_control" = "bbr";
   };
 
-  environment.systemPackages =
-    (with pkgs; [
-      bubblewrap
-      ddcutil
-      docker
-      docker-compose
-      exfatprogs
-      flatpak
-      nh
-      sane-airscan
-      sane-backends
-      simple-scan
-      wget
-    ])
-    ++ [ displayBrightness ];
+  environment.systemPackages = with pkgs; [
+    bubblewrap
+    docker
+    docker-compose
+    exfatprogs
+    flatpak
+    nh
+    sane-airscan
+    sane-backends
+    simple-scan
+    wget
+  ];
 
   programs.steam.enable = true;
   programs.nix-index-database.comma.enable = true;