hi...
aafter long search i have found the reason and i have fixed it! i would like to share it with you in case other people got the same problem.
the problem is on kpowersave program. if this doesn't start, linux get the configuration as in yast2, BUT if it starts.. then the problem start. so i fixed it by creating a new profil in kpowersave and i made it to be quiet and use the lowest possible Hz. so this problem is fixed...
if someone got more questiosn please reply. i am glad to help