Hello,

I've installed eeebuntu 3.0 on my 901 eee PC which had Windows XP originally. With XP I had the battery charged up to 100% as it's supposed to, but with eeebuntu the charging stops at ±45% and it won't go further (see power history showing a charging curve).

Would you have an idea what it might be (please don't propose to boot in Windows to charge the battery ) ?
Thanks!

That is weird... but maybe the battery is simply used up and has only 45% of it's original capacity? How old is the battery?

Well, I got it new from a store about a year ago, so one can consider it not being that old. The power manager tells me the battery capacity is 91%, but upper charge percentage is 45% And the strangest thing is that it does charge the battery to 100% in Windows.

Well the gnome-power-manager is know for it's lets say controversial measurements - try sth else, like the panel applet. I remember that for Win there was a nifty little application called BatteryBar, maybe there is linux port out there...

Check what acpi -V says, what was the last chare like.

Also you may try formatting the battery - that means completely depleting it, in the last phase preferably running bios board, until it shuts down. Then recharge it for like 15 hours, repeat the whole operation at least 3 times. But if Win can charge it...

If it's a Li-Io Battery, don't do this. They can't be formated and don't have a memory effect. But completely depleting or high charge levels hasten capacity loss and decrease Lifetime. Li-Io's feel best "flat" cycled. Don't keep them at 100% for long periods and recharge before they reach 50% to get maximum lifetime and minimum capacity loss over time.

It's possible that one cell in your battery died and the capacity got reduced by 50% from that. The battery circuits store various information about the battery like actual capacity and capacity by design. So if XP measures the charge depending on actual capacity (actual charge / actual capacity * 100)% and EB3 depending on original capacity (actual charge / capacity by design * 100)% they could both be right.

To determine the problem, fully charge the battery and then read the Information about the actual Energy, Energy fully charged and Energy by design (all in Wh) from the battery.