fix bluetooth not work after resume

nix/configuration.nix

@@ -22,6 +22,9 @@
     };
     cleanTmpDir = true;
     kernelPackages = pkgs.linuxPackages_latest;
+    extraModulePackages = with config.boot.kernelPackages; [
+      rtl8821ce
+    ];
   };
 
   networking = {
@@ -110,6 +113,13 @@
       cliphist
       jq
       bash-language-server
+      duckdb
+      sqlite
+      usbutils
+      llvmPackages_19.clang-tools
+      ghc
+      hyprpaper
+
       (anki-bin.overrideAttrs {
         src = pkgs.fetchurl {
           url = "https://github.com/ankitects/anki/releases/download/24.11rc2/anki-24.11-linux-qt6.tar.zst";
@@ -177,6 +187,7 @@
     };
   };
 
+  hardware.enableAllFirmware = true;
   hardware.bluetooth = {
     enable = true;
     powerOnBoot = true;
@@ -328,4 +339,12 @@
   services.usbmuxd.enable = true;
 
   programs.nix-ld.enable = true;
+
+  systemd.services.fix-crappy-bluetooth = {
+    wantedBy = [ "post-resume.target" ];
+    after = [ "post-resume.target" ];
+    script = builtins.readFile ./scripts/hack.usb.reset;
+    scriptArgs = "0bda:c831";
+    serviceConfig.Type = "oneshot";
+  };
 }

nix/flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1732014248,
-        "narHash": "sha256-y/MEyuJ5oBWrWAic/14LaIr/u5E0wRVzyYsouYY3W6w=",
+        "lastModified": 1732521221,
+        "narHash": "sha256-2ThgXBUXAE1oFsVATK1ZX9IjPcS4nKFOAjhPNKuiMn0=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "23e89b7da85c3640bbc2173fe04f4bd114342367",
+        "rev": "4633a7c72337ea8fd23a4f2ba3972865e3ec685d",
         "type": "github"
       },
       "original": {

nix/scripts/hack.usb.reset

@@ -0,0 +1,81 @@
+#!/usr/bin/env bash
+
+#
+# Resets the specified bluetooth USB adapter.
+# Restarts bluetooth service.
+#
+# This is to work around an issue where after suspend, the bluetooth adapter is
+# not working and needed to be unplugged and re-plugged.
+#
+# This inelegant script basically automates this.
+#
+
+set -e
+set -u
+PS4=" $ "
+#set -x
+
+#
+# Values can be found using `lsusb`:
+# 
+#      Bus xxx Device yyy: ID VVVV:PPPP Integrated System Solution Corp. Bluetooth Device
+#                              ^    ^
+#                   ID_VENDOR-/    /
+#                      ID_PRODUCT-/
+#
+ID_VENDOR="${1/:*/}"
+ID_PRODUCT="${1/*:/}"
+
+_reset_paths() {
+	for p in "$@"; do
+		echo 0 > "$p"/authorized
+		sleep 1
+		echo 1 > "$p"/authorized
+	done
+}
+
+#
+# Main function for the script.
+#
+main() {
+	echo "Resetting USB bluetooth devices."
+	# Not strictly needed, but stops bluetooth.
+	# It will, in any way, be started at the end.
+	systemctl stop bluetooth
+	sleep 4
+
+	# Using a function allows use of local and declare.
+	local p
+	local found_vnd
+	local found_prd
+	declare -a paths
+
+	# For all usb devices,
+	for p in /sys/bus/usb/devices/*; do 
+		# Try to check vendor/product IDs
+		found_vnd="$(cat "$p/idVendor" 2>/dev/null)" || :
+		found_prd="$(cat "$p/idProduct" 2>/dev/null)" || :
+
+		# When both match
+		if [[ "$found_vnd" == "$ID_VENDOR" && "$found_prd" == "$ID_PRODUCT" ]]; then
+			# Add to valid paths
+			paths+=("$p")
+		fi
+	done
+
+	# Reset all paths
+	_reset_paths "${paths[@]}"
+	sleep 1
+	# Twice for good luck
+	_reset_paths "${paths[@]}"
+
+	# Waits for everything to settle down
+	sleep 2
+
+	# Restarts bluetooth.
+	systemctl restart bluetooth
+	echo "Done resetting USB bluetooth devices."
+}
+
+# Calls up main.
+main "$@"