Fn key not working

Test the action rather than Fn alone

1. Choose a top-row key and compare its action with and without Fn in the app where you need it.
2. Fn often changes commands inside the keyboard and may not appear as an independent browser event. An unlit Fn position alone does not identify a failed key.
3. If only brightness or volume fails, test a standard F-key action too; app shortcuts and device controls can have different requirements.

Windows: check the documented Fn or F Lock control

1. Look for an Fn Lock symbol or F Lock key and check the model manual. Some models use Fn+Esc; others use another combination.
2. The Microsoft All-in-One Media Keyboard, for example, toggles Fn Lock with Fn+Caps Lock. Apply that only to that model.
3. If laptop brightness or media actions remain missing, obtain the hotkey software and updates for the exact laptop from its manufacturer.

macOS: choose standard function keys

1. Use Fn/Globe with a top-row key to invoke its standard function-key action on an Apple keyboard.
2. To make F1–F12 the default, open System Settings → Keyboard → Keyboard Shortcuts → Function Keys and enable Use F1, F2, etc. keys as standard function keys.
3. For a third-party keyboard without that setting, check its Mac mode and manufacturer utility.

Compact keyboard layers

On a keyboard without a dedicated function row, use the documented Fn layer. A physical 60% layout and an OS character layout are separate settings. Changing the input language does not add a missing function row.