I'm using a Lenovo Z-5070 Ci7. I had a battery life of nearly 4 hours when I was using Ubuntu 14.04 LTS.
After updating to Vived Vervet (15.04) my battery life is reduced to nearly 2 to 2.5 hours. It's almost halved. I use TLP and I've also changed the kernel boot mode options in
/etc/default/grub and I still have a bad battery life. I'm not using extended graphics either. Is this a routine bug or is there something that can/should be done?