Do you sharing what settings you have?
Nokia-N900:~# kernel-config show current kernel configuration: current frequency: 900 supported frequencies: 125 250 500 550 600 700 750 805 850 900 950 1000 1100 1150 min. frequency: 125 max. frequency: 900 avoid frequencies: 125 active frequencies: 0:30,90 250:38,180 500:48,360 550:48,400 600:54,430 700:54,430 750:54,430 805:54,430 850:54,500 900:54,500 950:54,500 1000:60,500 1100:72,520 1150:72,520 SmartReflex VDD1=0, VDD2=1 governor ondemand: ignore nice load= 0, up threshold= 75, sampling rate= 150000, powersave bias= 0