Installed Ubuntu 9.04 Desktop on my laptop. Worked great. Installed with AC adapter powering the laptop. Would boot in less than 20 seconds, no hang ups, no errors.
Later tried booting with AC power unplugged (fully charged battery). This time boot time was over one minute, with several apparent hangs while booting -- had to push space bar to move boot along.
Yet if I put the laptop on AC power, immediately boot up and power down is super fast.
What settings do I need to change so that i get a fast boot on battery as on ac power.