No Video During BitLocker Pin Screen Using a WD19 or WD22 Dock with a Belkin UN-3 KVM

The BitLocker pin screen may not display on a full high-definition (FHD) external display that is connected to a Belkin KVM while using a DisplayPort (DP) cable from the docking station with the laptop lid closed. This affects Belkin devices in the UN-3 family.

Affected Platforms:

• Latitude 5320
• Latitude 5430
• Latitude 9420
• Precision 3470
• XPS 17 9700

Affected Docks:

• WD19DCS - Dell Performance Dock
• WD22TB4 - Dell Thunderbolt Dock

The FHD external displays show the BitLocker pin screen if either the docking station or the Belkin UN-3 KVM is disconnected. The BitLocker pin screen also displays if an FHD monitor is directly connected to the computer.

This is expected behavior due to a KVM limitation.

There are several possible resolutions for this.

• Type in the PIN for BitLocker during the blank screen and then press Enter.
• When using FHD external display connected to the KVM Console Out, connect the dock to the Belkin KVM UN-3 using HDMI instead of DP.
• Use monitors with a display resolution that is greater than 1920x1080.