add instructions to avoid sleeping while plugged in

arch.md

@@ -10,6 +10,7 @@
     - [Firewall](#firewall)
     - [Power Management](#power-management)
     - [TPM2 LUKS Decryption](#tpm2-luks-decryption)
+    - [Don't sleep while plugged in](#dont-sleep-while-plugged-in)
     - [Fingerprint Reader Support](#fingerprint-reader-support)
     - [AppImage Support](#appimage-support)
     - [Bluetooth](#bluetooth)
@@ -181,6 +182,19 @@ sudo ufw enable
 
 2. `pacman -S tpm2-tss`
 3. `systemd-cryptenroll /dev/vda2 --wipe-slot=tpm2 --tpm2-device=auto --tpm2-pcrs=""`
+### Don't sleep while plugged in
+
+This is needed for the Framework 13 (11th gen) since sleeping while plugged in to a dock
+will prevent it from waking up.
+
+/etc/systemd/logind.conf
+
+```conf
+...
+HandleLidSwitchExternalPower=lock
+HandleLidSwitchDocked=ignore
+...
+```
 
 ### Fingerprint Reader Support