After a few days of tests and reboots i think i have found something....

There are many posts of people using kp49 without any battery issue...

In the meanwhile, there are many others asking why kp49 drains the battery a lot faster if compared to kp48...

Observing my N900 i have found both of the situations, BUT.... WHEN?

When the battery drains fast, the cpu is always at full clock or remains locked on an high clock profile never changing from that value also if the is apparently there is no load.
Very often, also rebooting, the situation does not change.

In other situations, same phone, same profile (usually i use the "default" one) there is almost no drain and the batteryeye draws a orizontal line.

So what changes?

Look at dmesg... if you can find a
"DSPTrace DSP MMU FAULT "
the battery drain will be like a waterfall!!!!

Many times, also during the boot process you can find that error.
If you start with that, you can be sure, say bye bye to your battery....

If you start the phone without errors, and the battery drain is ok, if while playing media file or running something a DSP FAULT message appears on dmesg, from that moment the cpu will remain locked at an high clock and the battery drain will go to the stars!

Any suggestion or confirm to my teory is welcome!



Thanks to all for this great comunity work and forum!