I've noticed since the very 1'st day I installed ubuntu 18.04 my battery life surprisingly reduced.so I checked system monitor. I noticed that only one of my CPU core is always run on high usage while other cores are in an idle stage. so I installed laptop model tools utility. then under the plugged stage, all the CPU cores work simultaneously with the same usage.i`ve attached two screenshots showing that 1st one is while on battery power 2nd one is just after plugged into power code.anyone can help me to optimize my CPU under the battery power?
CPU usage under battery power
CPU usage just after plugged into power