Skip to content

FAQs for Openterface Mini-KVM

Welcome to the dedicated FAQ for our flagship product, the Openterface Mini-KVM. If you can’t find the answer you’re looking for, feel free to email us at info@openterface.com or join our community such as Discord and Reddit(/reddit), where you can connect with our dev team and an amazing group of users!

List of Questions

Basic
Software
Switchable USB Port & File Transfer
Technical
Control Mechanism
Troubleshooting
More

Basic

What makes the Mini-KVM our flagship product?

The Openterface Mini-KVM represents our most feature-complete KVM solution, offering:

  • Plug-and-play functionality for fast, stable troubleshooting
  • No dependency on network connectivity
  • Full BIOS-level access
  • Switchable USB port for seamless file transfers
  • Broad compatibility across operating systems
  • Open-source hardware and software
  • Backed by an active and supportive community

What’s the difference between the Basic Pack and the Toolkit Pack?

We offer two purchase options:

  • Basic Pack: Includes the Openterface Mini-KVM and a Quick Start Guide.
  • Toolkit Pack: Includes everything in the Basic Pack plus a Toolkit Bag, HDMI & USB cables, an Extension Pin Cap, and a Mascot Sticker for added convenience.

For a detailed breakdown, visit: Openterface Mini-KVM Product Page

What are Openterface MiniKVM's key features?

  • Video Input: Up to 3840x2160@30Hz, via HDMI (Note: With the use of an adapter, it can also support VGA, Micro HDMI, DVI, and other video input sources)
  • Supported Video Resolutions: Up to 1920x1080@30Hz
  • Control: Full keyboard and mouse emulation
  • File Transfer: Switchable USB 2.0 port
  • Power: USB-powered (no external adapter needed)
  • Software: Cross-platform host applications
  • Compatibility: Works with most operating systems
  • Open Source: Both hardware and software

What host computers are compatible?

To use this mini-KVM, the host computer must install one of these host applications to support MacOS, Windows, Linux and Android.

What target devices are compatible?

No pre-installation or configuration is required on the target device. As long as the target device supports UI operations with video output (e.g., HDMI, VGA) and has a USB port to receive emulated keyboard and mouse control (HID) signals, it can be used. Thus, supported target device platforms include Windows, MacOS, Linux, Android, and iOS.

Will there be technical support and documentation?

Extensive documentation for the Openterface Mini-KVM can be found on our website at Openterface.com. We continuously update these resources to optimize your experience with the device. For technical support, we invite you to join our community for sharing queries and insights among fellow users and our expert team. If your issue remains unresolved, our team is available to provide further technical assistance. You can reach out via this email: info@openterface.com.

Can I order accessories like VGA-to-HDMI converter cable separately?

Yes! You can find all available accessories here and purchase them separately through our TechxArtisan Shop.

Can I use the Mini-KVM to control a target device that only has a USB-C port (e.g., certain phones, tablets, or newer MacBooks)?

Yes. To output the target device’s screen via HDMI and receive keyboard/mouse signals (HID) via USB-A, you’ll need a USB-C to HDMI + USB-A adapter. Once you plug that adapter in, connect it to the Mini-KVM as normal. Here’s an example scenario showing a MacBook Pro controlled by another MacBook Pro via the Mini-KVM.

Some devices may not support HDMI output

Not all phones and tablets with USB-C ports can send a video signal over HDMI. Check your device’s specs or test by connecting it to a standard monitor to confirm it works before using the Mini-KVM.

Software

Where can I download the host applications?

Visit our Install Host Application page for official downloads to support MacOS, Windows, Linux and Android.

Privacy & Security: Be cautious when using third-party host app

As our project is open source, you may find alternative versions of host applications compatible with our Mini-KVM developed by others. While these can offer additional features, please ensure you review their security and privacy practices. The Openterface Team cannot guarantee or be responsible for the safety of third-party applications.

Why do features differ across different host apps?

Our dev team actively maintains host applications for macOS, Linux, Windows, and Android, but due to platform-specific challenges and limited resources, development progress varies. That means some features might appear first on one platform and take longer to arrive on others.

We're doing our best to sync feature development across all platforms, but it’s a work in progress.

Your feedback plays a big role in shaping our development roadmap — whether through our community or GitHub repository. Every suggestion helps us prioritize what matters most to you!

If you're a developer, your contributions are incredibly valuable — and we’d love your help in speeding up the process!

Which host app currently offers the best experience?

As of March 2025, the Qt-based host apps for Windows and Linux offer the most comprehensive feature set overall. The macOS version stands out for its smoothest and most refined user experience, thanks to deeper system integration and UI enhancements. The Android app is a convenient option on the go, with more features steadily catching up.

Is there a web app I can use on Chrome or other platforms?

Yes! One of our awesome community members, Kashall, built a lightweight open-source web app you can use directly in your browser: openterface-viewer.pages.dev. It’s not yet part of our official documentation, but our dev team gave it a spin and found it solid, easy to use, and super handy — especially on Chrome or when you want something quick and browser-based. Give it a try!

Is there a host app supporting Apple's mobile devices?

We are currently exploring compatibility with Apple's mobile systems, such as iOS and iPadOS. Due to Apple's stringent controls, these platforms may not support wired connections with third-party devices. However, the situation could change, or there might be potential workarounds. If you have any insights or suggestions, we welcome you to join our community to discuss them with us. We are committed to enhancing the convenience of our device by supporting as many systems as possible. If you're keen to help out with our development, come hang out with us in the community or shoot us an email!

What if F11 doesn't work on macOS applications?

On macOS, pressing F11 shows the macOS desktop instead of passing the F11 key to the app and the target computer. To fix this, you can unbind F11 from the "Show Desktop" function.

Fixing F11 Key Issue on macOS
  1. Go to System Settings.
  2. Select Desktop & Dock.
  3. Scroll down and click the "Shortcuts…" button.
  4. Find "Show Desktop" and set it to the hyphen (-) at the bottom of the dropdown list.
  5. This change will allow the F11 key to pass through to your application on the target computer.

Switchable USB Port and File Transfer

Can the Mini-KVM support file transfers?

Yes, the Openterface Mini-KVM includes a switchable USB-A port shared between the host and target devices.

Can the switchable USB-A port be toggled in software?

With the hardware upgrade to v1.9, yes! It supports both physical flipping and toggling at the software level.

Why USB 2.0 instead of USB 3.0?

USB 2.0 is fully capable of handling video capture at 1080p@30Hz, transmitting HID signals (for keyboard and mouse), and managing standard-speed file transfers between the target and host computers. This makes our product a speedy, lightweight, and portable solution, exactly as designed.

Using USB 3.0 would make the PCB design much more complex and significantly increase production costs. Additionally, while USB 3.0 does offer faster file transfers, it also generates more heat, which could shorten the lifespan of the device.

We are considering the application of USB 3.0 for the next version, targeting more professional use scenarios and stationary KVM solutions.

Technical

Is the Mini-KVM open-source?

Yes! The Openterface Mini-KVM is fully open-sourced in both hardware and software, certified by OSHWA, and supported by a vibrant community. If you are interested in contributing, please contact us at info@openterface.com. Stay tuned!

Can I access a device's BIOS settings?

Yes, the direct connection of the Openterface Mini-KVM enables access to low-level BIOS or firmware settings.

This feature stands in contrast to software-based KVM solutions or remote control applications like TeamViewer and VNC, which are typically not capable of BIOS-level interactions.

Why doesn't the keyboard control work at the BIOS level for some older target computers?

It seems that some old computers' BIOS can't recognize our device's USB hub, which can cause issues with our emulated keyboard and mouse not working properly at the BIOS level. We're keeping an eye on this problem.

We've had a report that on one specific HP computer, the HP Engage Flex Pro, the keyboard doesn't work at the BIOS screen, though it functions normally once the operating system boots up.

If you encounter the same issue, please report it to us via a GitHub issue.

How is video/data transmitted?

Video data is captured via HDMI and transmitted over USB 2.0 to the host computer for display. The switchable USB 2.0 port allows USB drive or other USB device sharing between the target and the host.

How does the Mini-KVM handle power?

The device does not require an external power supply, as it is designed to be powered through its USB Type-C connections from the host, enhancing its portability. In scenarios where the target device is a low-power micro-computer, such as a Raspberry Pi, it could be powered through the host via the Mini-KVM's switchable USB port. However, this is not recommended. The standard method of operation is to have an external power supply to the target device.

Can I DIY this device?

Absolutely! We're a bunch of passionate makers who love to DIY, and we are making sure this project is open source in both hardware and software. You can technically build it from scratch. We're even thinking about posting a guide on how to DIY a breadboard version of our product that would also be compatible with our software.

Our community is already experimenting with different hardware versions. Check out our community posts to learn more, share your own DIY experiences, or even join our USB DIY Contest, co-hosted with Crowd Supply! Plus, you might find that with a few tweaks to the code, our software could work seamlessly with your creative DIY setup!

Can I use a longer orange USB-C cable for the host connection?

We don’t recommend using a USB-C host cable longer than 1.5 meters (the orange one) due to signal and power stability issues.

If you must use a longer host cable, you'll need to inject additional power to maintain reliable performance. Here are three supported methods:

  1. USB-A Power Injection
    Plug a USB-A male to male cable into the Mini-KVM’s Switchable USB-A port to provide 5V power.

  2. Power via Extension Pin
    Use the hidden extension pin (under the protective cap) to directly supply power.

  3. Type-C Power Splitter
    Use a USB-C Y-splitter (1 male to 2 female) between the cable and the Mini-KVM. One leg connects to your host computer, the other to a power source.

Why does this matter?

From our testing, longer host-side cables (over 1.5m) can cause voltage drop and signal degradation, especially with high data rates like video transmission. That’s why our included orange cable is short and power-efficient by design.

✅ Target side note: The same applies to the black USB cable (target side). Try to keep it under 1.5 meters too — the Mini-KVM can draw power from either side, and stability depends on cable quality and length.

Control Mechanism

Will there be a version with wireless or Ethernet connectivity?

Currently, we're not planning to add wireless or Ethernet connectivity to our Openterface products. We're focused on providing fast, stable control over USB directly to your target device, so you don't have to worry about network issues.

But hey, we're always open to feedback! If you think there's a real need for this feature, or if you're struggling to find a good KVM-over-IP solution, drop us an email: info@openterface.com. And remember, if we decide to expand our connectivity options, our community will be the first to know.

How is this different from other KVM solutions?

Curious about how the Openterface Mini-KVM stacks up against other solutions? Check out our detailed Comparison page.

Does it work with a PS/2 computer?

No. We are aware that there are still many old headless computers out there that require PS/2 keyboards and mice. As far as we know, there isn't yet an elegant solution for converting USB HID signals to split into PS/2 keyboard and mouse signals. We are still investigating this matter and considering how to support PS/2 in future versions of the Mini-KVM. If you know of any solutions that could elegantly work with our Mini-KVM, please share them with us. Thank you!

Can I use multiple Mini-KVMs with one master computer?

Yes, you can! Our Mini-KVM can technically handle this, but we're still tweaking the code and running tests. We're focusing on making sure that our software can automatically link up the keyboard and mouse with the right video source when you use more than one Mini-KVM at a time. Also, we're sprucing up the software's UI to make it better for this kind of setup. Stay tuned to our community updates for when we roll out this feature!

Can it power on/off the connected computer?

Not directly — MiniKVM doesn’t have built-in ATX power control. However, it does include extension pins that open up the possibility for an add-on module to handle ATX power switching.

While our dev team hasn’t prioritized this hardware expansion yet, it’s definitely on our radar. If you're into hardware development and would like to contribute or prototype an ATX extension, we’d love to hear from you! Join the community and help shape what’s next.

What about video latency and resolution?

Our device handles 1080p video output with under 140 milliseconds of latency, making your control experience smooth and seamless. Check out its specifications.

What are the supported input and output video resolutions of the Openterface Mini-KVM?

The Openterface Mini-KVM supports a wide range of video input resolutions, including up to 4K (4096 x 2160 @ 30Hz). However, its effective capture resolution — the resolution actually processed and displayed on your host computer — is 1920x1080. Resolutions above that will be downsampled, which may introduce slight visual blur due to pixel merging.

Key Definitions: Input Resolution & Effective Max Capture
  • Input Resolution: The resolution output by your target computer.
  • Capture Resolution: The resolution at which the Mini-KVM captures and transmits video to the host computer.
  • Effective Max Capture: 1920x1080 — for the best clarity and performance.
Supported Input Resolutions

The Mini-KVM can accept and process common standard resolutions, including but not limited to:

  • 4096 x 2160 @ 30Hz, 29.97Hz (Highest resolution supported by the Openterface Mini-KVM)
  • 3840 x 2160 @ 30Hz, 29.97Hz (4k resolution with 16:9 aspect ratio)
  • 2100 x 1050 @ 60Hz (optimized for mobile devices with 16:9 aspect ratio)
  • 1920 x 1200 @ 60Hz (16:10 aspect ratio)
  • 1920 x 1080 @ 60Hz (The best display resolution with 16:9 aspect ratio)
  • 1680 x 1050 @ 60Hz (16:9 aspect ratio)
  • 1600 x 900 @ 60Hz (16:9 aspect ratio)
  • 1440 x 900 @ 60Hz (16:9 aspect ratio)
  • 1280 x 1024 @ 60Hz (5:4 aspect ratio)
  • 1280 x 960 @ 60Hz (4:3 aspect ratio)
  • 1280 x 800 @ 60Hz (16:10 aspect ratio)
  • 1280 x 720 @ 60Hz (16:9 aspect ratio)
  • 1152 x 864 @ 60Hz (4:3 aspect ratio)
  • 1024 x 768 @ 60Hz (Optimized for old CRT monitors resolution with 4:3 aspect ratio)
  • 800 x 600 @ 60Hz (Optimized for old CRT monitors resolution with 4:3 aspect ratio)
  • 640 x 480 @ 60Hz (Optimized for old CRT monitors resolution with 4:3 aspect ratio)
Best Practice

Set both the target output and the Mini-KVM capture resolution to 1920x1080 for optimal sharpness and minimal latency.

What happens with target output resolutions above 1080p?

If your target computer outputs at a higher resolution than 1080p, the Mini-KVM will merge multiple pixels into one for display on the host. This may make the image appear blurry.

Improving Blurry Image

You can improve visual clarity on the host side by scaling up the display. While this won’t restore full detail, it smooths the output and enhances visibility.

Troubleshooting Glitches

If you're seeing video glitches or no signal after changing resolution or refresh rate:

  1. In the host app, lower the capture resolution temporarily to 640x480 @ 30Hz.
  2. On the target device, revert to a supported standard resolution (like 1080p).
  3. Switch back to your desired resolution in the host app once stability returns.
Avoid Non-Standard Settings

Non-standard resolutions or refresh rates above 60Hz may exceed the Mini-KVM’s stable operating limits and cause glitching or instability.

Summary Tips
  • Best clarity: 1920x1080 input + 1920x1080 capture
  • Avoid blur: Try not to exceed the 1080p capture limit
  • Scaling helps: Increase display scale on host side if using 4K input
  • Troubleshoot with low resolution: Use 640x480 @ 30Hz as a fallback

By understanding how input and capture resolutions interact, you can optimize your setup for smooth, high-quality remote control with the Openterface Mini-KVM.

Is it suitable for gaming?

The current design is geared toward technical and IT operations — it’s built for reliable device control, configuration, and troubleshooting rather than high-resolution or latency-sensitive gaming.

That said, some of our more playful and curious users have already tested it with lighter games like Minecraft or emulators, and it works just fine for those! So while it’s not designed for AAA gaming, casual or retro-style games are definitely doable.

Will future versions support higher-quality displays?

We know a lot of you are looking for top-notch display features. While it's not our main focus right now, based on your feedback, we're considering adding enhanced display capabilities in a professional version of the Openterface Mini-KVM.

Why doesn't it stream video over local IP?

The Openterface Mini-KVM is designed for stable, low-latency control via direct HDMI and USB connections. While it's technically possible to stream video over a local network, our current focus is on reliability through wired connections. That said, we are exploring features like VLC or even VNC integration in our host apps for future releases.

How about KVM control over the internet?

As for streaming over the internet, that’s a whole different challenge — it involves hosting remote services, handling security, and rethinking parts of our business model. It’s not off the table, but it’s a big step.

That said, since our Mini-KVM relies on your host computer, you can already pair it with existing remote desktop tools to control your target computer remotely.

We’re always open to ideas — if you have thoughts on how you'd like remote streaming to work, feel free to email us or join the conversation in the community!

Can it work with VGA, DVI, DisplayPort, etc.?

Sort of. The Openterface Mini-KVM captures video through an HDMI port. However, you can use various video adapters like VGA-to-HDMI, DVI-to-HDMI, miniHDMI-to-HDMI, or DP-to-HDMI, to connect different video sources.

Will there be a video recording feature for troubleshooting?

Yes! We're developing a "dashcam-style" continuous recording feature that will:

  • Capture short video segments of the target computer
  • Allow frame-by-frame review of critical moments (like fast-disappearing error messages)
  • Support at least 30fps for clear analysis of rapid events (e.g., kernel panics during boot)

This will be particularly valuable for debugging scenarios where:

  • Error messages flash too quickly to read
  • Systems crash during early boot sequences
  • You need forensic analysis of console output

The feature is currently on our development roadmap - stay tuned for updates!

Troubleshooting

Why does it sometimes have issues with USB hubs?

When a USB hub is used on the target side, the Openterface Mini-KVM might become unstable. This is because the Openterface Mini-KVM relies primarily on the target port for power. If the USB hub connected to the target is fully loaded, it may cause a significant voltage drop, leading to instability in the Openterface Mini-KVM due to insufficient power. If you need to use a USB hub on the target side, consider using a powered USB hub with an external power supply to ensure stable operation.

What if the app doesn't display the target screen or input is unresponsive?

If you encounter instability with the Openterface Mini-KVM—such as the app not displaying the target's screen or the inability to control the mouse and keyboard—try disconnecting all the cables. After a brief moment, reconnect the cables and try again. This simple reset often resolves connection issues.

My host app or system shows absurd resolutions like 43184x24228@44Hz, and there's no video. What should I do?

This symptom often points to a firmware issue on the capture chip. On Windows, open “USB Tree Viewer” and confirm you see “MACROSILION Openterface USB Composite Device” instead of just “MACROSILION USB Composite Device.” On Linux/macOS, check lsusb -v output for “Openterface.” If the capture firmware has reverted to factory default, re-flash the Openterface firmware (available on our GitHub releases page). If that doesn’t fix the issue, please reach out to our support team.

I re-flashed the capture firmware, but I still can’t get normal video capture. What else can I try?

  1. Double-check that your device enumerates correctly in a Windows environment with “USB Tree Viewer” or via lsusb -v on Linux.
  2. Confirm that your host app is the latest official release.
  3. If you continue to see no improvement—or bizarre resolutions and no display—contact our support. We’ll work with you on additional diagnostics and, if needed, arrange a replacement.

Why is my screen completely black when using a VGA-to-HDMI cable or adapter?

Our VGA-to-HDMI converter cable needs extra power to function. If you see only a black screen, you might be missing a power connection. (1)


  1. This is an example of a setup where the USB cable was left unplugged
Steps to make the VGA-to-HDMI cable work
  1. Connect the USB Power

  2. Our VGA-to-HDMI cables include a USB plug that must be connected to a powered USB port (either on the Mini-KVM’s switchable USB port or the target computer). This powers the VGA-to-HDMI conversion chip.

  3. Confirm Resolution

  4. Make sure the target computer is using a supported resolution, such as 1280x1024 or 1024x768 at 60Hz.

  5. Resolutions outside the supported range can produce a black or distorted screen.

  6. Try Another Adapter

  7. If possible, test with a different VGA-to-HDMI adapter or cable. Some converters lack proper power draw and can cause blank screens.

Still no luck? Snap a photo of your setup (including cables) and send it to our support team. We’ll help you troubleshoot or arrange a replacement if necessary.

More

How can I contribute to this project?

Absolutely! There are loads of ways you can chip in:

  • If you're into coding, help us out by reporting and fixing bugs.
  • Good with words and tech? You could lend a hand with our documentation.
  • And if you're a wizard with languages, why not help translate our docs to help more folks get on board?
  • If design's your thing, we're always looking for fresh takes on graphic design, app UI, and making our device even more user-friendly.
  • Fancy helping to keep our community buzzing? We could use your skills there too.

Your support and contributions are what keep Openterface Mini-KVM growing. Thanks for being part of our adventure! 🚀 Got the urge to help but don't see a perfect fit? Just shoot us an email!

Want to review our gadget?

Hey, we love making noise and spreading the word about our Mini-KVM! If you're from the press or rocking it on social media and fancy taking our product for a spin, we're all ears. Whether you're into detailed reviews, unboxing videos, or just want to give us a shoutout, we're here for it and let's make some waves together! 🎉 Just drop us an email NOW!

What advanced features are planned?

We are excited about the potential of the mini-KVM and are committed to documenting all our current ideas in a comprehensive roadmap. This roadmap will outline advanced features and future developments we envision for the device. We look forward to developing these features in collaboration with our community. Stay tuned for more updates as we continue to grow and innovate together.

How does it integrate with AI?

Our long-term vision is for Openterface Mini-KVM to serve as the physical interface layer between AI agents and real-world computers. Inspired by early projects like OthersideAI’s self-operating computer, and now further validated by recent breakthroughs like Anthropic’s Claude 3.5 models, this vision is quickly becoming more tangible.

Mini-KVM acts as the “eyes” and “hands” — capturing real-time video from a target machine and enabling keyboard/mouse input via USB. Combined with a capable host computer running an AI agent, this setup could allow LLMs to observe, interpret, and operate full desktops — even across platforms — without needing any software installed on the target machine.

We’re still in the early stages of this integration, but the possibilities are expanding fast. If you’re experimenting with AI agents and want to explore this space together, we’d love to hear from you!

What accessories are available?

We offer a range of accessories to enhance your experience with the Openterface Mini-KVM. Check out our TxA Shop for more details on available products, including our VGA to HDMI Converter Cable.

Your curiosity and support fuel our progress, and we want to ensure that every one of your questions finds an answer. Please note that as time progresses, the content above in our FAQs may become outdated. If your query isn't covered in this FAQ, always check our website openterface.com for the most current information. Also please don't hesitate to join our enthusiastic community. We're active on our Subreddit at /r/Openterface_miniKVM/ and our Discord Openterface server, where you can ask questions, share ideas, or just have a chat about all things tech.

Moreover, feel free to reach out directly to our dedicated team by sending an email to info@openterface.com. We love hearing from you and are always here to help!

Have feedback about this page? Let us know here.