By Techy tone 
When I first learned about USB-C Alt Mode on motherboards, I didn’t know what it did. I found out that it lets me use the USB-C port to connect a monitor or other video devices. It’s really helpful when I want to reduce the number of cables I use.
USB-C Alt Mode on motherboards allows the USB-C port to support video output, such as connecting monitors. It’s a versatile feature that reduces cable clutter and improves connectivity. Make sure your motherboard and connected device support this function for optimal use.
In this article, we will discuss how USB-C Alt Mode works on motherboards, its benefits for video output, and how to ensure your devices support this feature for improved connectivity and fewer cables.
What is USB-C Alt Mode?
USB-C Alt Mode (Alternative Mode) is a feature that allows USB-C ports to support video output in addition to standard data and power functions. This means the same USB-C connection that charges your phone can also send video to a monitor, reducing the need for multiple cables.
How Does USB-C Alt Mode Work?
Alt Mode works by allowing the USB-C port to switch its normal data functions to alternative functions like DisplayPort, HDMI, or Thunderbolt, depending on what is connected. This is why you can use the same port for both data transfer and video output.
What Can USB-C Alt Mode Be Used For?
USB-C Alt Mode can be used for:
- Video output: Connecting your PC to a monitor or TV.
- Data transfer: Moving files between devices.
- Power delivery: Charging laptops or other devices. It’s a versatile feature that streamlines your setup by reducing the need for separate cables for each task.
Why Is USB-C Alt Mode Important for Motherboards?
USB-C Alt Mode is crucial for modern motherboards because it allows users to simplify their connections. Instead of needing separate HDMI, DisplayPort, and USB connections, Alt Mode combines everything into one USB-C port. This is especially useful for slim laptops or compact PCs with limited port space.
How to Check if Your Motherboard Supports USB-C Alt Mode
To see if your motherboard supports USB-C Alt Mode:
- Check the specs: Look for terms like “USB-C with DisplayPort Alt Mode” in your motherboard’s specifications.
- Review the manual: Motherboard manuals often detail which ports support Alt Mode.
- Check the port: Some motherboards have USB-C ports labeled specifically for video output or Alt Mode functions.
Benefits of USB-C Alt Mode on a Motherboard
1. Fewer Cables
With USB-C Alt Mode, you can use a single cable to charge your device, transfer data, and connect to an external display, reducing clutter.
2. Versatile Connections
Alt Mode gives you flexibility by allowing the USB-C port to handle various connections like HDMI or DisplayPort, simplifying your setup.
3. Future-Proofing
As more devices adopt USB-C for all-in-one connectivity, having Alt Mode on your motherboard ensures compatibility with the latest tech trends.
USB-C Alt Mode vs. Standard USB-C: What’s the Difference?
The key difference between standard USB-C and USB-C with Alt Mode is the ability to output video. A standard USB-C port can only handle power and data, while an Alt Mode-enabled USB-C port can also transmit video signals to an external display.
How to Use USB-C Alt Mode for Video Output
If your motherboard supports USB-C Alt Mode, here’s how to use it for video output:
- Connect a USB-C to DisplayPort or HDMI cable to your motherboard’s USB-C port.
- Plug the other end into your monitor or external display.
- Ensure the display is set to the correct input (HDMI, DisplayPort, etc.).
- Your display should now show video output from your PC.
Connecting External Displays Using USB-C Alt Mode
One of the most popular uses for USB-C Alt Mode is connecting external monitors. If you’re running out of HDMI or DisplayPort connections, Alt Mode gives you an extra video output option. Just ensure your monitor supports the type of connection (HDMI, DisplayPort) you’re using via the USB-C cable.
Other Devices Compatible with USB-C Alt Mode
Aside from monitors, USB-C Alt Mode can connect to:
- Docking stations
- Projectors
- Tablets and smartphones (with DisplayPort or HDMI adapters)
- Virtual Reality headsets This makes Alt Mode ideal for those who frequently switch between different devices.
Is USB-C Alt Mode the Future of PC Connectivity?
With more devices supporting USB-C Alt Mode, it’s likely to become a key feature in the future. As manufacturers continue to streamline device designs, combining power, data, and video in a single port helps save space and simplify user experiences.
What to Do If USB-C Alt Mode Isn’t Working?
If you’re having trouble with USB-C Alt Mode, try these steps:
- Update your drivers: Check if your GPU and motherboard drivers are up to date.
- Test another cable: Sometimes faulty cables cause Alt Mode issues.
- Check compatibility: Ensure your devices support Alt Mode.
USB-C Alt Mode and Multiple Display Setups
Alt Mode is great for setting up multiple displays. If your motherboard and GPU both support it, you can connect one display via HDMI or DisplayPort and another using the USB-C Alt Mode. This can be handy for multitasking or gaming setups.
Can USB-C Alt Mode Deliver 4K Video?
Yes, USB-C Alt Mode can support 4K video output, depending on your device and monitor. If both your motherboard and display support it, you can enjoy high-resolution video through a single USB-C cable.
Does USB-C Alt Mode Affect Charging Speed?
No, USB-C Alt Mode doesn’t affect charging speed. While it allows video and data transfer, power delivery is still managed independently. You can charge devices at normal speed while using Alt Mode for other functions.
How Does USB-C Alt Mode Impact Docking Stations?
USB-C Alt Mode is crucial for docking stations, enabling them to handle multiple displays, USB devices, and charging through a single port. It streamlines workspaces by reducing cable clutter and simplifying connections.
Is USB-C Alt Mode Compatible with Thunderbolt 3 Ports?
Yes, Thunderbolt 3 ports are compatible with USB-C Alt Mode. Thunderbolt 3 uses the same USB-C connector and offers higher data transfer rates, making it ideal for those who want faster performance with Alt Mode.
Can I Use USB-C Alt Mode for Audio Output?
Yes, USB-C Alt Mode can handle audio output along with video when connected to compatible monitors or audio devices. Many monitors with built-in speakers support audio via USB-C Alt Mode.
Why Isn’t USB-C Alt Mode Working on My Device?
If USB-C Alt Mode isn’t working, check your cable, ensure both your motherboard and display support the feature, and verify that your drivers are up to date. You may also need to enable the function in your device’s settings.
Does USB-C Alt Mode Support Dual Monitors?
Some motherboards and docking stations support dual monitors through USB-C Alt Mode, but it depends on your specific hardware. You may need a USB-C to dual DisplayPort or HDMI adapter for this setup.
Can I Use USB-C Alt Mode on Older Monitors?
Yes, you can use USB-C Alt Mode on older monitors with the right adapter, such as a USB-C to HDMI or VGA adapter. However, older monitors may not support high resolutions or refresh rates.
Is USB-C Alt Mode Available on All Motherboards?
No, not all motherboards support USB-C Alt Mode. You’ll need to check your motherboard’s specifications to confirm if it has this feature. It’s typically found on newer and higher-end models.
Can USB-C Alt Mode Be Used for Gaming?
Yes, USB-C Alt Mode can be used for gaming, especially for connecting to high-refresh-rate monitors. However, ensure that your motherboard and monitor support the necessary bandwidth for smooth gameplay.
Add DP Alt Mode port to a motherboard…or using DP Alt mode from a DP Output
To add DP Alt Mode to a motherboard, upgrade to one that supports USB-C with DisplayPort functionality. Alternatively, use a DisplayPort to USB-C adapter if your motherboard has a DisplayPort output. This allows video output through a USB-C cable for high-resolution displays.
X670E-I ITX motherboard DP Alt Mode?
The ASUS ROG Strix X670E-I ITX motherboard supports DisplayPort Alt Mode through its USB-C ports. This allows video output when connected to a compatible monitor using a USB-C to DisplayPort cable. Make sure your CPU’s integrated graphics also supports this feature for proper functionality.
USB Type C Hub and display output
To use a USB Type-C hub for display output, the hub must support DisplayPort Alt Mode. This feature allows video output through the USB-C connection. You’ll need:
- A hub with DisplayPort or HDMI ports.
- A device with a USB-C port that supports DisplayPort Alt Mode (usually a laptop or motherboard with integrated graphics).
- A monitor that supports the input from the hub (e.g., HDMI or DisplayPort).
Check your hub and device specifications to ensure compatibility with video output.
What hardware support needs to be present for USB Type-C alternate modes?
For USB Type-C alternate modes support, the device needs:
- USB-C Port with Alt Mode capability.
- Controller that supports Alt Mode.
- CPU/GPU with video output via USB-C.
Check these specs in your device for Alt Mode functionality.
USB C to HDMI
To use USB-C to HDMI, you need:
- USB-C port that supports DisplayPort Alt Mode.
- A USB-C to HDMI adapter or cable.
- A display or television that has an HDMI port..
Ensure your device supports video output via USB-C.
Which Gigabyte AM4 motherboards have Alt Mode header support?
Some Gigabyte AM4 motherboards that have USB Type-C headers with support for DisplayPort Alt Mode include:
- Gigabyte X570 AORUS Master
- Gigabyte X570 AORUS Ultra
- Gigabyte B550 AORUS Master
- Gigabyte B550 AORUS Pro
These boards typically offer USB-C front panel headers with DisplayPort Alt Mode support, allowing video output when paired with compatible hardware. Make sure to review the motherboard specifications to verify compatibility.
Motherboards with video transmission via USB-C (Alt Mode)
Motherboards with video transmission via USB-C (DisplayPort Alt Mode) include:
- ASUS ROG Strix X670E-I Gaming WiFi
- ASUS ROG Crosshair X670E Hero
- Gigabyte X570 AORUS Master
- MSI MEG X570 ACE
- ASRock X570 Phantom Gaming-ITX/TB3
These motherboards support video output through USB-C when paired with a compatible CPU (with integrated graphics) or GPU. Always check specs for Alt Mode support.
FAQs
What is USB-C Alt Mode on a motherboard?
USB-C Alt Mode allows the USB-C port on your motherboard to support video output, data transfer, and power delivery.
How do I know if my motherboard supports USB-C Alt Mode?
Check the specifications or manual of your motherboard. Look for terms like “DisplayPort Alt Mode” or “USB-C with video output.”
Can I connect my monitor using USB-C Alt Mode?
Yes, if your monitor and motherboard support USB-C Alt Mode, you can connect them using a USB-C to HDMI or DisplayPort cable.
What devices work with USB-C Alt Mode?
Devices like monitors, docking stations, projectors, and even some smartphones and VR headsets can use USB-C Alt Mode.
Why is USB-C Alt Mode important?
USB-C Alt Mode simplifies connectivity by allowing one port to handle video, data, and power, reducing the need for multiple cables.
What is USB-C alt mode?
USB-C Alt Mode allows the USB-C port to transmit video and audio, supporting standards like DisplayPort or HDMI through a single cable. This enables connection to external displays without needing a separate video port.
Can USB-C on motherboard be used for display?
Yes, USB-C on a motherboard can be used for display if it supports DisplayPort Alt Mode. This allows video output to external monitors via a compatible USB-C to HDMI or DisplayPort cable.
What is MHL Alt mode for USB Type-C?
MHL Alt Mode for USB Type-C allows the USB-C port to transmit video and audio signals using the Mobile High-Definition Link (MHL) standard. This enables devices to connect to external displays, such as TVs or monitors, while also providing power and control capabilities. MHL Alt Mode supports high-definition video up to 4K resolution and audio, making it useful for streaming content from mobile devices to larger screens.
What is VESA DisplayPort alt mode on USB Type-C?
VESA DisplayPort Alt Mode on USB Type-C allows video and audio transmission through a USB-C port using the DisplayPort standard. It enables connections to external displays, supporting high resolutions (up to 8K) and multiple monitors, all through a single cable.
Motherboard with usb-c front panel?
ASUS ROG Strix Z690-E
MSI MAG B550 Tomahawk
Gigabyte X570 AORUS Master
ASRock B550 Phantom Gaming 4
MSI MPG Z590 Gaming Edge
DP Alt Mode?
DisplayPort (DP) Alt Mode allows video and audio transmission through a USB-C port, enabling connection to external monitors without needing a separate DisplayPort or HDMI connector.
How to enable DisplayPort Alternate Mode?
To enable DisplayPort Alt Mode:
- Ensure your device’s USB-C supports it.
- Use a USB-C to DisplayPort/HDMI cable.
- Connect to a compatible monitor.
- Adjust display settings if needed.
It usually activates automatically.
How do I know if my USB-C supports DP alt mode?
To check if your USB-C supports DP Alt Mode:
- Check the manual or specs of your device.
- Look for a DisplayPort (DP) logo near the USB-C port.
- Search for video output or Alt Mode support in product details.
- Contact the manufacturer if unsure.
What is the maximum resolution of USB-C DP alt mode?
The maximum resolution of USB-C DP Alt Mode can reach up to 8K at 60Hz or 4K at 120Hz, depending on the version of DisplayPort and the device’s capabilities.
Conclusion
USB-C Alt Mode is a game-changer for modern motherboards, providing more flexibility and fewer cables for video output, power, and data transfer. By using this feature, you can simplify your PC setup and future-proof your system for the latest devices.