How To Adjust Brightness With Fn+3/fn+4 With Opie?

[grooz]

Original Zaurus ROM allows backlight brightness to be adjusted with Fn+3 and Fn+4, but it won't work with Opie.  Is there a simple solution or I have to do some coding?

[Mickeyl]

That needs some coding, i.e. assign keycodes to FN+3, FN+4 and handle them via ODevice.

[grooz]

That needs some coding, i.e. assign keycodes to FN+3, FN+4 and handle them via ODevice.
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I see. Another question then: how can the keycodes be assigned?  To be honest, I have very little knowledge of that low-level stuff.