It looks like there are more device firmware available for Lenovo ThinkPad P1 (and X1 Extreme).

Gnome Software Centre

Based on the list from Gnome Software Center, the available firmware are:

  • Thunderbolt Firmware N2ETF12W
  • System Firmware (Embedded Controller) 0.1.11
  • System Firmware (?) 0.1.23

It’s time to update all of them on my P1.