Ubuntu Jaunty 9.04 Desktop - fast boot on laptop with AC power- very slow boot if on battery power

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.
Who is Participating?
Try under "System", "Administration", "Services" and disable the Powermanagement (acpid or apmd try each one separately first).
Fabio MarzoccaFreelancerCommented:
Remove all "quiet" entries in /boot/grub/menu.lst and watch the boot messages in order to isolate the problem that is causing this delay on startup.
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