Comment 68 for bug 629258

Balaji, if Ubuntu is getting wrong readings from your battery, you need to open a new bug report for that. This bug report only covers the problem where a battery life estimation isn't provided to the user on systems where power consumption data isn't provided by the hardware. The power manager needs to be programmed to produce its own estimate of the rate of charge/discharge, through periodic sampling of the total charge level, when the hardware doesn't report charge/discharge directly.

Also, there may be some laptops that can report this information, but where the Linux kernel doesn't know how to retrieve it.