Can no longer change the brightness with F1/F2 on my PowerBook

[Vincent Lefevre <vincent@vinc17.org>]

I've just upgraded the kernel (2.4.18-newpmac -> 2.4.21-powerpc)
on my G4 PowerBook and I can no longer change the brightness of
the screen with function keys F1/F2.

When I use "showkey" from the console, I get for these two keys:

keyboard: unknown scancode e0 4c
keyboard: unknown scancode e0 54

What should I do to make them work?

TIA,

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