Precision 5480 - Dell Optimizer - Presence Detection - Stopped Functioning After Latest Windows 11 Update

Perform a hard reset to see if it may help:

1. Turn off your computer.
2. Disconnect the power adapter from your computer.
3. Remove the base cover.
4. Remove the battery.
5. Press and hold the power button for 20 seconds to drain the flea power.
6. Install the battery.
7. Install the base cover.
8. Connect the power adapter to your computer.
9. Turn on your computer.

If instructions sended by @Chino de Oro are not helping.

Try BIOS update to newest version, update Dell Optimizer application and enable Presence Detection.