[lubuntu] missing text at lightdm

hi,
finally i fount a workable xorg.conf for my Powerbook G4. lets look at my attached photos, there is no texts nowhere. i think something is wrong at the xorg.conf... i used a fc-cache -fv command, now the lightdm accepts the login, but desktop dont appers just the fan spins at full(maybe also 100% of cpu util) and the only thing i can see just the wallpaper. :(
thanks!