I looked at the BIOS settings online, and really there is not much you can do. Also I do not have Ubuntu running on a laptop handy at this time, but I can tell you from experience what you can do. (these are personal suggestions).
Optimizing battery life helps you get the most out of battery operation, prolonging the charge/recharge cycle and improving recharging efficiency. You are advised to follow the suggestions set out below:
- Dim your screen
- Cut down on programs running in the background
- Cut down external devices
- Turn power off to Serial device
- Hibernate not standby
Source: "Laptop battery optimization and maintenance" on Cnet.com
PowerTOP is a Linux tool to diagnose issues with power consumption and
power management. In addition to being a diagnostic tool, PowerTOP
also has an interactive mode where the user can experiment various
power management settings for cases where the Linux distribution has
not enabled these settings.1
Learn more about PowerTOP and download the latest version, 1click here.