Precision Mobile 7510 / 7710: No Pre-Boot video on external monitor using a DisplayPort connection via an E-Port dock


Precision Mobile 7510 / 7710: No Pre-Boot video on external monitor using a DisplayPort connection via an E-Port dock



The following article deals with explaining why there is no hardware fault at work when you connect a Precision Mobile 7510 and 7710 and external monitors together via a DisplayPort connection and a simple E-Port Dock and there's no Pre-Boot video seen on screen.


Table of Contents:

  1. No External Pre-Boot Video through DisplayPort on a Precision 7510 / 7710 via an E-Dock
  2. Why there is no External Pre-Boot Video through DisplayPort on a Precision 7510 / 7710 via an E-Dock

No External Pre-Boot Video through DisplayPort on a Precision 7510 / 7710 via an E-Dock

This article is specifically about the Precision mobile 7510 and 7710 systems. When docked to an E-port dock and using external monitors via DisplayPort, these systems do not show any video during the pre-boot environment.

Pre-Boot Environment: This covers the period from POST through the Dell Splash Screen through to the Windows Operating System (OS) starting up. It includes those intermediate screens such as the F12 menu and the BitLocker Prompt.

An external monitor connected via DVI does not experience the same lack of video.


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Why there is no External Pre-Boot Video through DisplayPort on a Precision 7510 / 7710 via an E-Dock

This situation only occurs on a Precision Mobile 7510 or 7710 using external video through a DisplayPort connector on a simple E-Port Dock. You do not see this if you use another display connector type or if you use the advanced E-Port dock. (The E-Port+).

This is not a fault or issue with the hardware. It is each of the hardware parts working as designed. I'll explain how below:

  • The Precision Mobile 7510 or 7710 provides Video output 1 and Video output 2, via the E-Port docking connector on the base of the unit. (Fig.1)

Docking video Diagram System

Fig.1 Precision Docking Station Port.

  • Simple E-Port Docks allows for Video output 1 through a DVI connection and Video output 2 through a DisplayPort connection. (Due to the availability of ports on the dock. Fig.2)

Docking video Diagram Simple

Fig.2 Simple E-Port Dock

  • Advanced E-Port Docks do not experience this as they allow both Video outputs to go to a DisplayPort connection or both to go to a DVI Connection instead. (Fig.3)

Docking video Diagram Advanced

Fig.3 Advanced E-Port Dock

  • The Intel GPU - Can access the Video output 1 in Pre-Boot only by design.
  • A dedicated GPU (NVidia or AMD) - Can access Video outputs 1 and 2 in Pre-Boot.
  • Intel, NVidia and AMD GPU's have access to both Video outputs 1 and 2 in the OS.

There are three quick things you can change to stop this from occurring: (Any one of the three options would work.)

  • You can disable the switchable graphics option in the BIOS to force the dedicated GPU to take over.
  • You can connect an external monitor via DVI instead of DisplayPort.
  • You can use the advanced E-Port dock instead.


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Article ID: SLN305432

Last Date Modified: 09/14/2019 09:23 AM

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