hi thanks for your reply, my setting commands are as follow, it is indeed in 850mhz , so what can i do if i still wanna keep it at 850mhz but make it more stable? thanks rm /etc/default/kernel-power rm /etc/default/kernel-boot ln -sf /usr/share/kernel-power-settings/ideal /etc/default/kernel-power ln -sf /usr/share/kernel-power-settings/boot /etc/default/kernel-boot thanks