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Model-specific diagnostic path

Logitech MX Keys S connected but typing on the wrong computer

MX Keys S supports Easy-Switch across up to three devices. A healthy keyboard can therefore appear unresponsive on one computer when a different Easy-Switch host is selected.

QUESTIONWhy is MX Keys S typing on another computer?

Start with evidence

Run the tests that separate the likely branches

Keyboard TestPress keys and verify that the browser receives the expected keyboard events.
Run →
Keyboard Event ViewerInspect key, code, repeat, and modifier data from browser keyboard events.
Run →

Decision table

What the observation changes

ObservationWhat it meansNext action
Keys work after selecting another Easy-Switch keyKeyboard hardware was functioning; active host selection was the issue.Keep the intended host mapped to a known Easy-Switch slot.
Works on Bluetooth but not BoltKeyboard switches work; receiver/pairing path is higher priority.Check Logi Bolt receiver/pairing/software.
No host receives raw key eventsBroader power/input issue.Charge, reconnect and test another host.

Sequence

Work from reversible checks to escalation

  1. 01

    Press the Easy-Switch key assigned to the current computer.

  2. 02

    Run DeviceOK keyboard test.

  3. 03

    Compare Bluetooth and Logi Bolt if both are available.

  4. 04

    Check app focus/mappings only after raw key events arrive.

Likely areas

Keep these branches separate

Wrong Easy-Switch slotBluetooth vs Logi Bolt pairingOS focusKeyboard hardware

Repair boundary

When to stop changing settings

If no host receives key events after re-pairing/charging, use Logitech support.