I had a problem when I upgraded kernels as well.  When on the 2.6.15 
kernel I2C was a module.  I did not change this config when I first 
compiled the 2.6.16 kernel.  I re-compiled w/ I2C compiled intot he 
kernel & the lcd & sensor started to work but I still cannot get the 
keyboard light to work.

Konstantin V. Gavrilenko wrote:
> I have the same problem as you do, but in my case the ambient lights
> sensor doesn't work either.
> This happened after a switch from 2.6.15 to 2.6.16. I think the reasons
> might be in the I2C module that has been changed.
>
> In the 2.6.15 it was I2C_KEYWEST while in 2.6.16 it is named  I2C_POWERMAC.
> Wrote an email to the author of the pbbuttons but had no reply. It would
> be great if we can sort out the problem in this list.
>
> p.s.
> machine         : PowerBook5,4
> motherboard     : PowerBook5,4 MacRISC3 Power Macintosh
> detected as     : 287 (PowerBook G4 15")
>
> pbbuttonsd, version 0.7.5
> Linux maca 2.6.16-gentoo-r7
>
> yours,
> kos
>
>
>   
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