How to Share a USB-C Dock Between Two Laptops with a 40Gbps KVM Switch

Many people use two laptops at the same desk: a company computer for work and a personal laptop for everything else, or two systems for different projects. The usual solution is a tangle of duplicate chargers, displays, keyboards, mice, storage devices, and network adapters. A USB-C KVM switch can simplify that setup by allowing both laptops to share one compatible USB-C monitor or docking station.

The GenixLinks 40Gbps USB-C KVM Switch for Two Laptops is designed for high-performance USB-C, USB4, and Thunderbolt workstations. It switches a shared monitor or dock between two computers while supporting data, video, connected peripherals, and power delivery through the selected USB-C connection.

This guide explains how a 40Gbps USB-C KVM switch works, what equipment it can share, how to set it up, and which compatibility details should be checked before installation.

What Is a USB-C KVM Switch?

A traditional KVM switch allows multiple computers to share a keyboard, video display, and mouse. A USB-C KVM switch applies the same idea to a modern one-cable workstation.

Instead of switching separate video and USB connections, the switch routes a compatible USB-C connection from one of two laptops to a shared device. That shared device may be a USB-C or Thunderbolt monitor, or it may be a docking station that connects the monitor, keyboard, mouse, Ethernet, storage, audio, webcam, and other peripherals.

Only one laptop is connected to the shared output at a time. When the active input is changed, the monitor or dock disconnects from the first computer and reconnects to the second. This provides a cleaner alternative to repeatedly moving a USB-C cable between laptops.

Why Share a Dock Instead of Individual Peripherals?

A docking station already combines many desk connections into one host cable. Placing a USB-C KVM switch between two laptops and a compatible dock makes that entire workstation switchable.

Depending on the dock and connected equipment, a single button press can move access to:

One or more external displays
A keyboard and mouse
USB storage and card readers
A webcam, microphone, and speakers
Gigabit or multi-gigabit Ethernet
Printers and other USB accessories
USB Power Delivery for the active laptop

This type of arrangement is useful for home offices, hybrid workstations, content-creation desks, software-development environments, test benches, and other locations where two computers need to use the same peripherals.

40Gbps Bandwidth for Modern Workstations

The GenixLinks switch supports connection bandwidth up to 40Gbps. This allows it to handle demanding combinations of video, storage, networking, and USB peripherals when all devices and cables in the connection are compatible.

The switch can be used with compatible USB-C, USB4, Thunderbolt 3, and Thunderbolt 4 equipment. It can also be connected to compatible Thunderbolt 5 systems or docks, but throughput through the switch remains limited to 40Gbps. Connecting an 80Gbps Thunderbolt 5 dock does not convert the switch into an 80Gbps path.

Available bandwidth is shared by everything traveling through the connection. Display traffic, external storage, Ethernet, webcams, and other USB devices all use part of the link. Actual performance therefore depends on the laptop, operating system, dock or monitor, peripheral load, and selected video mode.

High-Resolution Video Support

With compatible equipment, the switch supports display modes up to 8K at 60Hz, 6K at 60Hz, or 4K at 240Hz. Display Stream Compression, commonly called DSC, may be required for some high-resolution or high-refresh-rate configurations.

The maximum resolution is determined by the complete signal chain, including:

The USB-C or Thunderbolt capabilities of each laptop
The graphics hardware and operating system
The switch and its built-in cables
The connected monitor or docking station
Any display cable connected to the dock
The number of active displays
Whether DSC is supported and enabled

A laptop with a USB-C port that supports only data and charging cannot produce video simply because it is connected to the switch. The host port must support the required video mode, such as DisplayPort Alternate Mode or Thunderbolt video.

The switch is designed for compatible USB-C and Thunderbolt displays, including high-resolution monitors such as Apple Studio Display and selected Dell UltraSharp, ASUS ProArt, Samsung ViewFinity, LG UltraFine, and MSI models. Always verify the capabilities of the exact monitor and laptop configuration.

Sharing a USB4 or Thunderbolt Dock

The switch can connect two laptops to a compatible USB-C, USB4, Thunderbolt 3, or Thunderbolt 4 docking station. This is often the most flexible way to build a shared workstation because the dock manages the individual peripherals.

Compatible examples listed for the GenixLinks switch include the CalDigit TS4 and TS3 Plus, Plugable TBT4-UDZ and TBT3-UDZ, Lenovo ThinkPad Universal Thunderbolt 4 Dock 40B0, OWC 11-Port Thunderbolt 4 Dock, Anker 778, Satechi Thunderbolt 4 Dock, and Kensington SD5780T.

The dock must use a detachable host cable. A dock with a permanently attached host cable cannot be connected to the switch through a USB-C coupler. Couplers can introduce compatibility and signal-integrity problems and are not supported for this application.

Before purchasing, confirm that the dock’s host port is designed to accept a standard detachable USB-C or Thunderbolt cable and that the dock supports the video, charging, and peripheral features required by both laptops.

Up to 140W Power Delivery Pass-Through

The GenixLinks switch can pass through up to 140W of USB Power Delivery from a compatible monitor or docking station to the selected laptop. This can reduce cable clutter by allowing the same connection to carry data, video, and charging power.

The switch does not generate charging power. The monitor or dock must provide USB Power Delivery, and the active laptop must support the offered voltage and wattage. Actual charging power is determined by the power source, cable path, power negotiation, and laptop.

Power is passed to the active laptop only. The inactive laptop does not receive charging power through the shared output. If both computers need to remain charged at all times, connect a separate charger to the inactive computer.

RF Remote and Push-Button Switching

The active computer can be selected using the button on the switch or the included RF remote. Because the remote uses radio frequency rather than infrared, it does not require a direct line of sight to the switch.

This is helpful when the switch is installed under a desk, behind a monitor, or in a cable-management area. The remote can remain within easy reach while the USB-C cables and switch hardware stay out of the way.

After switching, the operating system may need a few seconds to detect the monitor, dock, network adapter, storage devices, and other peripherals. The exact reconnection time depends on the connected equipment.

Built-In Cables and Signal Integrity

The switch includes two built-in input cables for the laptops and one built-in output cable for the shared monitor or dock. This integrated design reduces the number of removable high-speed connections in the signal path.

The end-to-end built-in cable path already reaches approximately 1.8 meters, consisting of a 1-meter section and a 0.8-meter section. Do not add a USB-C extension cable. High-speed USB4 and Thunderbolt connections are sensitive to total cable length, cable construction, and the number of connection points. An extension may reduce bandwidth or cause unstable video, device disconnects, or charging problems.

Place the switch so its built-in cables reach both laptops and the shared device without strain, sharp bends, or additional extensions.

How to Set Up the GenixLinks USB-C KVM Switch

Check both laptops. Confirm that their USB-C or Thunderbolt ports support the data, video, and charging features required by your setup.
Check the shared device. Use a compatible USB-C or Thunderbolt monitor, or a dock with a detachable host cable.
Connect the output. Attach the switch’s output cable to the monitor’s upstream USB-C port or to the dock’s host port.
Connect the laptops. Attach each built-in input cable to a compatible USB-C, USB4, or Thunderbolt port on one laptop.
Connect peripherals to the dock or monitor. This may include displays, keyboard, mouse, Ethernet, storage, webcam, audio devices, and power.
Turn on the equipment. Allow the active laptop to detect the shared monitor or dock and all connected devices.
Test switching. Use the switch button or RF remote to select the second laptop, then confirm that video, data, peripherals, network access, and charging reconnect correctly.

For the first installation, begin with only the monitor or dock connected. After confirming that basic switching works, add peripherals one at a time. This makes it easier to identify an incompatible device or excessive bandwidth demand.

Important Compatibility Checks

USB-C connector shape does not guarantee functionality

USB-C describes the connector, not the supported features. Some ports provide only USB data, while others add video, charging, USB4, or Thunderbolt. Review the laptop manufacturer’s specifications for each port.

Operating systems handle external displays differently

The number of supported displays and the available resolutions can vary by laptop model, graphics hardware, dock, and operating system. This is especially important with multi-monitor docks and certain Mac computers.

Thunderbolt 5 operates at a reduced link rate

The switch can be used in compatible Thunderbolt 5 environments, but the shared path is limited to 40Gbps. Devices that require an 80Gbps connection will operate at a lower negotiated rate or may not provide every high-bandwidth feature simultaneously.

The dock needs a removable host cable

A permanently attached dock cable cannot be extended through a coupler for this setup. Choose a dock with a clearly identified upstream or host port that accepts a detachable cable.

Only the selected laptop receives shared power and peripherals

The inactive computer is disconnected from the shared dock or monitor. It will not use the dock’s network, storage, display, or charging connection until selected.

Troubleshooting a USB-C KVM Setup

If the monitor or dock does not reconnect correctly, try these steps:

Confirm that the switch output is connected to the dock’s host port rather than a downstream USB-C port.
Verify that both laptop ports support video and the required USB-C, USB4, or Thunderbolt features.
Remove any USB-C extension cable, coupler, or unnecessary adapter.
Test the monitor or dock directly with each laptop before adding the switch.
Temporarily reduce the display resolution or refresh rate.
Disconnect high-bandwidth storage or other peripherals and test again.
Confirm that the dock or monitor has adequate power.
Install current operating-system, graphics, Thunderbolt, USB4, dock, and firmware updates.
Allow several seconds after switching for the display and USB devices to reconnect.
If a device remains unavailable, disconnect and reconnect it or restart the affected laptop.

Because the entire workstation shares one high-speed link, a problem can originate with any component in the chain. Testing each laptop directly with the shared monitor or dock is the fastest way to establish a working baseline.

Who Is This Switch Designed For?

A 40Gbps USB-C KVM switch is particularly useful for people who want a high-performance shared desk without maintaining two sets of peripherals.

Hybrid workers can alternate between a company laptop and a personal computer.
Developers and IT professionals can share a monitor, network connection, storage, keyboard, and mouse between production and test systems.
Content creators can move a high-resolution display, card reader, audio equipment, and fast storage between computers.
Home-office users can keep the desktop clean while avoiding repeated cable changes.
Technical workbenches can connect two systems to a single dock for configuration, testing, and troubleshooting.

A Cleaner Two-Laptop Workstation

The GenixLinks 40Gbps USB-C KVM Switch provides a practical way to share a compatible USB-C monitor or docking station between two laptops. Its 40Gbps connection, high-resolution video support, power-delivery pass-through, built-in cables, and RF remote make it suitable for modern one-cable workstations.

The most important step is checking the complete setup before installation. Both laptops must support the required USB-C features, the dock must have a detachable host cable, and the monitor or dock must provide the desired video and charging capabilities. With compatible equipment, the switch can replace a desk full of duplicate connections with one streamlined workspace.