Does this support uhd 4k, ie: 3840x2160/30p ? another kvm i bought that claimed 4k support only supports 1080p/1080p 3d ...

Keep in mind that the video card and the monitor has to support 3840 x 2160 4K resolution I have mine connected and I get 2560 x 1440 which is the max resolution that my monitor supports. Check your video display settings in your computer to find out what is the recommended setting that windows found for your display.

Does the switch “proxy” edid information when the host isn’t selected to talk directly to the monitor?

Its supposed to, but I have not found this magical 1080p/auto edid button that the manual keeps mentioning. So my lg ultrawide is stuck on 1080p for all 4 of my pc.

Will this work with a microsoft surface pro? does it come with the cables i will need?

NO - you would have to purchase more. All Surface Pro's only have 1x USB port and 1x mini-Display Port (not HDMI). You would have to purchase a mini-DP to HDMI video adapter (less than $10) to use it with this switch. Microsoft does sell a port replicator (~$150), but it also only has mini-DP video ports (so it does NOT help you to buy that). "Orion" said "Micro Surface Dock" could plug into this KVM, but only "later" said that you still need a video adapter. If you need this HDMI KVM switch, the easiest/best/cheapest thing to do would be to buy a simple "mini-DP to HDMI" video adapter and plug the (now HDMI) and USB into this KVM switch.

Is there a published instruction manual? I cannot seem to switch from windows 10, raspberian, or ubuntu. What are the keyboard and mouse commands?

A user manual should have come with the unit which gives keyboard hot-key switching codes. Double clicking the mouse scroll wheel should step you through the ports. You can also use the manual button for switching toa port.

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🎯 Master your multi-device domain with ultra HD precision!

CRYSTAL CLEAR 4 K ULTRA HD OUTPUT - Experience stunning 4K@60Hz video with zero lag, perfect for high-res monitoring and presentations.
COMMAND 4 DEVICES WITH ONE CONSOLE - Streamline your workspace by controlling 4 computers or DVR/NVR systems from a single USB keyboard and mouse setup.
PLUG AND PLAY UNIVERSAL COMPATIBILITY - Works flawlessly across Windows, Mac, Linux, and popular distros like Ubuntu and Fedora—no drivers needed.
ROBUST BUILD WITH CERTIFIED RELIABILITY - Durable metal body with FCC, CE, and RoHS certifications ensures long-lasting, professional-grade performance.
MULTIPLE SWITCHING MODES FOR ULTIMATE FLEXIBILITY - Switch effortlessly via mouse, hotkeys, wired remote, or manual button—control your workflow your way.

The CKLau 4Kx2K Ultra HD 4 Port HDMI KVM Switch lets professionals control up to 4 HDMI-enabled devices from one USB console, supporting 4K@60Hz video, USB 2.0 hub, and audio/mic integration. Compatible with major OS platforms and featuring multiple switching options, it’s a certified, durable solution designed for seamless multi-device management in demanding environments.

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Brand	CKLau
Manufacturer	CKLAU TECHNOLOGIES INC.
Product Dimensions	20.5 x 7.49 x 2.49 cm; 462.66 g
Item model number	CKLau-64Hua
Is Discontinued By Manufacturer	No
Color	HDMI2.0 KVM 4 Ports
Item dimensions W x H	20.5 x 7.5 x 2.5 cm
Wireless Type	Bluetooth
Operating System	Linux
Are Batteries Included	No
Item Weight	463 g

CKLau 4Kx2K Ultra HD 4 Port HDMI Cables KVM Switch Control 4 Computers/DVR/NVR/Servers with USB 2.0 Hub and Audio for Linux, Windows, Mac, Unix, Debian, Ubuntu, Fedora, Raspbian

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