There is a very tiny button that I have heard you press to reset.

Hi Peter C.

I wasn't able to find definitive information on the pin hole button either but I have some other information that might help.

I know this sounds really obvious, but have you tried shutting down your computer and restarting it? Sometimes, this will resolve the situation. The second thing I found was to discharge the static from your T480. If you haven't done that, it may fix the problem. To do this, first make sure that your laptop is completely powered off. Next unplug the device from the AC adapter. You will need to remove the external battery and then remove the back case, and finally the internal battery. Once the internal battery is removed, flip the computer over and press and hold the power button down for about 1 minute. Once you've done that, you can put your batteries back in, plug the charger back in, and finally turn your computer back on to see if that fixes your problem.

If this doesn't work, you may need to check your battery drivers to see if they need to be updated. If they have been updated, you may need to uninstall and reinstall the battery drivers. If those options don't work, you may need to update the Bios. I hope this helps!