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KVM Switch diagnostics

Test what the browser can see. Know when it cannot.

Check keyboard, mouse and display behavior on each computer to separate the KVM path from the attached peripherals themselves.

Run these first

Relevant live checks

Keyboard TestPress keys and verify that the browser receives the expected keyboard events.

Mouse Button TestVerify left, right, middle, and extra mouse button events.

Screen Resolution TestShow browser viewport, screen dimensions, and device pixel ratio.

Monitor Refresh Rate TestEstimate display refresh timing using animation frames.

First diagnostic sequence

Do the high-signal checks before risky changes

1
Test each peripheral directly on a computer
2
Compare each KVM input and port
3
Use manufacturer EDID or USB compatibility settings only after isolating the failing path

What DeviceOK/browser can help check

Verify keyboard and mouse events after switching
Show display resolution and refresh timing seen by the browser

What this browser page cannot prove

Read KVM EDID or USB emulation configuration generically
Measure signal integrity
Change KVM firmware