powerpc nvidia brigthness regulation not working an suspend

[Roberto Innocenti]

powerpc nvidia brigthness regulation not working an suspend

apt-cache policy xserver-xorg-video-nouveau
xserver-xorg-video-nouveau:
  Installato: 1:0.0.16+git20111201+b5534a1-1build2
  Candidato: 1:0.0.16+git20111201+b5534a1-1build2
  Tabella versione:
 *** 1:0.0.16+git20111201+b5534a1-1build2 0
        500 http://ports.ubuntu.com/ubuntu-ports/ precise/main powerpc Packages
        100 /var/lib/dpkg/status

lsb_release -rd
Description: Ubuntu 12.04 LTS
Release: 12.04

This bug affect ubuntu 12.04 powerpc on a PowerBook 12 inch with Nvidia Ge Force 5200

In /etc/yaboot.conf I have modified the append in this way
 initrd=/boot/initrd.img
 append="video=DVI-I-1:d video=LVDS-1:1024x768-24@60 video=TV-1:d quiet splash"
In this way work correctly the rendering of the display, but the brightness is non possible to change, and even the suspend dousen't work.