Systems attached to ThinkPad Advanced Mini Dock or ThinkPad Advanced Dock may experience lock-ups or application hangs after losing AC Power - ThinkPad R60, R61, R61i, T60, T60p, T61, T61p, T400, T500, W500
System that is attached to the ThinkPad Advanced Dock or ThinkPad Advanced Mini-Dock may hang or lock up if you lose AC power from the dock.
Any of the following Lenovo systems attached to the ThinkPad Advanced Mini Dock (models 2504-10x) or ThinkPad Advanced Dock (models 2503-10x):
ThinkPad R61, R61i
ThinkPad T60, T60p
ThinkPad T61, T61p
ThinkPad T400, T500
The ThinkPad Advanced Mini Dock or ThinkPad Advanced Dock needs continuous AC power to function. Legacy components (including serial or parallel peripheral devices in the dock) may cause unreliable operating system behavior if those devices lose power.
To ensure proper behavior by the ThinkPad Advanced Dock or ThinkPad Advanced Mini-dock, Lenovo recommends keeping a continuous supply of AC power attached to the back of the ThinkPad Advanced Dock and ThinkPad Advanced Mini-Dock.
Note: A new feature is added to newer versions of the system BIOS that will allow you to disable legacy devices. (Config>>Docking Station>>Legacy Devices on Mini-Dock>>Disabled)
This setting will prevent the ThinkPad from hanging when you lose AC power, but it will disable serial/parallel devices that are connected to the dock.