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I've Lenovo S400 laptop, dual boot with windows 7 and ubuntu 13.04.

The problem is that whenever I disconnect the power adapter, ubuntu shows that battery level is critically low and goes to sleep. When I resume it from sleep, it runs fine on battery power.

The problem might be the lenovo power management installed in Windows. When I set it to battery health mode, the battery doesn't charge over 60% and is good for battery health.

If I use the laptop mostly connected to power, and that's when it causes the sleep problem. When it is set to battery full charge mode, ubuntu just shows a warning of low battery for a moment but then runs fine.

In either case, the battery meter never works (shows 1% battery charge) while connected to power.

It looks like ubuntu takes a couple of seconds to detect the correct battery level and that's creating all the problem.

Lenovo doesn't provide any driver for ubuntu. A faulty battery meter (only when connected) is not an issue but the sleep problem is a bummer.

What can I do?

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closed as off-topic by Richard, karel, Eric Carvalho, Jacob Vlijm, Sneetsher Jun 22 '14 at 11:31

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