Tried this morning some tweaks and something is still weird . I was thinking the n9 may be unstable due to governor that changes often frequencies and voltages so I set the scale_min_freq same like scale_max_freq , so the cpu will stay at max everytime . I also tried to set governor to performance but phone freezes immediately when I set a higher frequency than 1360mhz .

Device is acting weird when I am doing these tweaks , it's very laggy and it sets a frequency after I change the scale_min_freq . I don't know how to explain better this situation , here's an example .

current speed is 1350mhz
set scale_min to 1400mhz
echo 1400mhz 1.4v to opptimizer
conky and everything else still showing 1350mhz
set scale_min to 800mhz (phone freezes)
set scale_min to 1400mhz (phone works but very laggy)
conky and everything else showing 1400mhz now

I can repeat these steps for any frequency , I also tried for 1700mhz and it worked , conky was showing 1700mhz but I know it's just a bug .

here's also a video of how device is acting after I pass the 1360mhz with the method presented above : http://www.youtube.com/watch?v=5H_bc_IkuOQ