Lenovo ThinkPad Thunderbolt 4 Workstation Dock User Manual page 9

When the dock is connected to both your computer and ac power, this indicator shows the computer status:
LED status
Solid white
Blinking white slowly (1 second on/off)
Off
When the dock is updating firmware, this indicator shows the update status:
LED status
Blinking rapidly (0.5 second on/off)
Off
Computer status
On
In sleep mode
Off or in hibernation mode
Firmware update status
Updating
Completed
.
Chapter 1 About the dock
5