UMPC Power Management: Origami Project


Q1_powerOver at The Origami Project team blog, Ross provides some useful insights to UMPC battery management; the approach is really geared towards Vista machines, but you can certainly apply the concepts to UMPCs running Window XP Tablet Edition 2005. Ross also created a Vista Sidebar gadget to help you get a better read on your battery life; you can download that right here.

Some personal modifications to Ross’s great thoughts: I routinely keep my screen backlight to the lowest setting that I can use. I also take advantage of different power settings between an AC profile and a battery situation. If I know I’m not going to use my Bluetooth keyboard for any length of time, I’ll actually disable the Bluetooth radio in Device Manager. I set my power button to put my device in Standby and I use it often. What tips would you add?


Lorie Ghamy

I use Process Tamer (free) to control low or high process prioriy in Widows XP (5 step availables). High for video and audio, and low or near for Explorer, XnView or Firefox.

The 2.00.15 (more hard to find than the newer) no needs of the code every 6 month. It’s nice to conserve audio or video fluidity while making anithing else !

And i use the external battery from Samsung for more Power !

Steve Paine

1 min screen blank, 3 min HDD spin down and 5-10 mins standby (depending on my device.)
Lowest backlight setting.
Wifi off on startup (from standby) and don’t leave USB devices attached.

Make sure you look for a LED backlit screen when choosing a UMPC. This is the BIG power saver. USB Wifi modules can be pretty heavy drains too. 2-3 watts is not uncommon for a cheap wifi module. N800 has a very impressive wifi module. Strong and low power.



I turned the Wifi in the Bios from ALWAYS ON to OFF..
It’s easy to turn on from menu when needed.



Actually, Citanic, Because of the way lcds work, that would actually use more power than setting the screen to all white. This is because lcds block certain colors of the white light to create the color you see. Since black is the absence of light, the screen is turning all transistors in the screen on to block the light. The point is moot, however, because the difference in power consumption due that what is on the screen is negligible. The lcd screen itself uses very little power. The backlight is what uses the huge majority of the power.

Ok, on to my tip. I have my screen set to turn off and my hard drive set to spin down after a short time (1 min for the screen and 5 min for the hard drive) and I have it set so my system goes into standby in ten minutes. When I’m using my tablet I almost always have the pen at the screen so I don’t really have issues with the screen turning off when I’m trying to read it.

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