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Difficulty: HardMobile Device Ports and Accessories

An IT support specialist is deploying new tablets for executive presentations. When connecting a tablet to an external HDMI conference room display via a multi-port USB Type-C hub, the external display reports 'No Signal', although the hub successfully charges the tablet and passes data to connected USB flash drives. Replacing the HDMI cable and monitor produces the exact same result. Which of the following is the most likely cause of this issue?

  1. The tablet's USB Type-C port lacks hardware controller support for DisplayPort Alternate Mode (Alt Mode).Answer
  2. B
    All USB Type-C ports natively stream Thunderbolt 4 video signals, but the hub requires an active battery calibration reset to enable video pins.
  3. C
    The tablet's Mobile Application Management (MAM) software policy is blocking the external monitor connection by misclassifying HDMI as an unencrypted POP3 mail synchronization protocol.
  4. D
    The multi-port hub requires a SO-DIMM adapter interface to convert digital video signals into peripheral USB data packets.

Answer

The tablet's USB Type-C port lacks hardware controller support for DisplayPort Alternate Mode (Alt Mode).
The correct answer correctly identifies that USB Type-C is a physical connector shape and that feature sets like video transmission depend on specific hardware protocol support, specifically DisplayPort Alternate Mode (Alt Mode). If the mobile device host controller does not support DP Alt Mode, video adapter capabilities will not function even if charging and USB data pass-through work normally.

Step-by-Step Solution

1
Analyze the physical and protocol capabilities of the USB Type-C interface.
USB Type-C is a physical connector standard that can carry multiple distinct protocols (USB data, USB Power Delivery, DisplayPort Alt Mode, Thunderbolt).
Not all USB Type-C ports implement every optional protocol.
2
Evaluate the reported symptoms from the scenario.
Power delivery and standard USB peripheral data work, but video pass-through fails completely.
Power delivery and standard USB data utilize standard pin sets, whereas video streaming requires DisplayPort Alt Mode support on the host controller and port.
3
Identify the underlying hardware limitation causing the failure.
The mobile host device does not support DisplayPort Alternate Mode on its USB-C controller.
Without DP Alt Mode support, the device cannot transmit native display signals out of the USB-C port to an HDMI adapter.

Key Concept

USB Type-C Alternate Mode capabilities vs physical connector form factor
Estimated Time:1m 30s
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Topics

Mobile Device Ports and Accessories

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