just intalled No-frills CPU Control and tried to underclock it to 1.2MHz and monitor it using cpuspy and the max frequency is also 1.2MHz.
does it really work or they just changed the numbering in the apps? lol
will keep it 1.2MHz and see hows my daily usage battery life
battery drain doesn't differs much during sleep so far. currently still testing around with the Governor and I/O Scheduler.
my aim is to get lower battery drain rate during heavy usage and of course to avoid increase of the temperature (quiet worst when using camera for a long period).