clarify tlp instructions

arch.md

@@ -160,11 +160,31 @@ sudo ufw enable
 1. For laptops install `tlp`
 
     ```bash
-    sudo pacman -S tlp
+    sudo pacman -S tlp tlp-rdw
     sudo systemctl enable --now tlp
+    sudo systemctl mask systemd-rfkill.service
+    sudo systemctl mask systemd-rfkill.socket
     ```
 
-2. For desktops install cpupower
+2. Then configure it with the following settings (optional)
+
+    /etc/tlp.conf
+
+    ```conf
+    # I've seen some issues with usb autosuspend
+    USB_AUTOSUSPEND=0
+    # Restore bluetooth/wifi state on reboot
+    # Otherwise it defaults to on
+    RESTORE_DEVICE_STATE_ON_STARTUP=1
+    # Disable wifi when plugged in
+    # You might not want this for continuity - eg. you're copying a file to a network
+    # share over wifi - plugging in will cancel the copy with this option enabled.
+    DEVICES_TO_DISABLE_ON_LAN_CONNECT="wifi wwan"
+    # Re-enable wifi when unplugged.
+    DEVICES_TO_ENABLE_ON_LAN_DISCONNECT="wifi wwan"
+    ```
+
+3. For desktops install cpupower
 
     ```bash
     sudo pacman -S cpupower