I have a laptop which I hook up to an external display when I'm at home. I also connected an external keyboard and mouse which makes it more comfortable for me.

I have noticed that pressing caps lock on the external keyboard does not light up the capslock indicator of the laptop keyboard (and vice versa).

When googling, I came across the setleds function, but when I type it into a console all I get is this:

KDGKBLED: Inappropriate ioctl for device

Error reading current flags setting. Maybe you are not on the console?

Any idea if I can get this working?