I previously used Xubuntu 9.10 32-bit, but recently started using Lubuntu 11.10 64-bit.

I have a Lenovo 3000 N200 laptop with an Nvidia Geforce Go 7300 chip. It has 8 possible LCD backlight brightnesses; I'll refer to them as level 0 to 7 here.

With Xubuntu 9.10, I could select any brightness easily. In Lubuntu 11.10 however, while the backlight controls still work (Fn-F10 and Fn-F11 on my keyboard), each press changes the brightness by two levels, like this when increasing the brightness:
0 -> 2 -> 4 -> 6 -> 7
and like this when decreasing:
7 -> 5 -> 3 -> 1 -> 0

So while I can still select any possible brightness level, it's a bit of a hassle. For example, to select brightness 5 I can change the brightness to maximum (7) then press Fn-F10 to reduce it to 5. To change from 5 to 4 I'd need to reduce it to 0 then press Fn-F11 twice to increase it to 2 then 4.

This happens with both the Nouveau and Nvidia binary drivers. Has anyone else experienced a similar problem?