It seems all the function keys are active by default on my lenovo t450s with elementary OS Freya. E.g. F5 and F6 control screen brightness on press. Usually I have to hold or hit the Fn key first.

Does anyone know how I can get the original functionality back of using the Fn key to toggle the function keys?

2 Answers 2


This is usually a BIOS setting. If there is nothing in there (perhaps it is set to Ctrl rather than Fn), you could try pressing Fn+Esc to toggle FnLock as is reported to work on earlier Thinkpad models.

  • Fn + Esc worked like a charm. I completely overlooked that. Thanks! Aug 23, 2015 at 17:03

You should use the BIOS setting, then you can still use Fn+ESC to toggle the opposite.

But if you always depend on Fn+ESC, sometimes you'll forget to enable it when you start up, and plus the green LED will over time Dim and consume a small amount of extra energy... for no real reason.

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