Function lock indicators in tray

In my notification tray, I see three icons for scroll lock, num lock and caps lock. What is causing these icons to appear? They start off white, and become red when enabled.

You are referring to the Enable keyboard LED setting.

You can enable or disable this setting in: MATE Tweak > Interface > Panel Features > Enable keyboard LED.

This feature allows MATE users who do not have LED indicators in their keyboard/laptop to see the current status of scroll lock, num lock, and caps lock.

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Neat-o. When i saw that I thought it was for some weird feature to disable LEDs from lighting.

Just a quick question about the icons; Where are they in the system?