Lucid displays blank screen after boot splash on battery power.

Hi all,
I'm on HP tx2000 Tablet PC, with nVidia GeForce 6150 Go onboard, 4GB of RAM, Ubuntu 10.04 amd64 Desktop.

I keep getting a blank screen after boot splash when I'm on BATTERY POWER.
Though I get a blank screen, the screen comes alive when I SUSPEND the laptop by closing the lid, and then RESUME the laptop.
Then I can see the logon box and whole desktop.

This does not happen with AC power. Very strange.
Usually people get problem by suspending their laptops (usually the screen not coming back after resuming), but now I SOLVE the problem by suspending my laptop. Well like I said I can somehow get the screen right, but I really can't (and don't want to) suspend and resume my laptop every time I boot.

Need assistance.

Problem occurs REGARDLESS of type of display driver I use. nVidia proprietary, nouveau... whichever driver I use, I get the same conclusion.

Any help will be greatly appreciated.