Thanks for the reply.
I've tried setting the voltage to lv, but it didn't help.
I also don't know how to make a custom voltage.
And about the updated Fcamera in devel, i couldn't find it.
My main reason for lowering the voltage is because my device spontaneously reboots.
And it won't boot up again until i put out it's battery and put it back in again.
So i lowered my voltage to xlv so it won't spontaneously reboot.
But it's still doing that, so i haven't got any success from this linux kernel-power.