powersave_bios=20 does not work for me. drain battery a lot. back to 0.
now usage time extended.

current configuration
min freq 250
max freq 700
smartreflex vdd1 & vdd2 = 1
ignore nice load=1
upthreshold=90
sampling rate=300000
not using CSSU but portrait hildon-desktop

anyway thanks for your patch and your hard work.