Symptom

On selected ThinkPad notebooks include ThinkPad X1 Carbon (5th Generation: 20K3, 20K4), ThinkPad T470, T470p, P51, P71, that support PXE through the ThinkPad USB-C Dock (40A9) and ThinkPad Thunderbolt 3 Dock (40AC), will need to have the PXE feature enabled in the BIOS (method to access BIOS).

Applicable Brands

ThinkPad

Applicable Systems

• ThinkPad X1 Carbon (5th Generation: 20K3, 20K4)
• ThinkPad T470
• ThinkPad T470p
• ThinkPad T470s
• ThinkPad P51
• ThinkPad P71

System Is Configured With

• ThinkPad USB-C Dock (40A9, 40A90090US, 03X7194)
• ThinkPad Thunderbolt 3 Dock (40AC, 40AC0135US, 03X7133)

Operating Systems

• Microsoft Windows 7
• Microsoft Windows 10

Limitations

For the ThinkPad USB-C Dock (40A9), the system must have a USB-C port which fully supports the following:

• Power Delivery (PD)
• Display Port Alternative Mode
• USB 3.0 Data Support

Solution

PXE support for these docks must be enabled in the respective ThinkPad BIOS Setup Utility.

Enable both these settings via BIOS -> Config (method to access BIOS).

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