I have a Lenovo Y460p running Ubuntu 12.04 (64-bit). The battery does charge normally, but unplugging the power supply only very briefly shows the correct battery indicator. After about 1 second, it reverts to the charging indicator.
If the power supply is connected the power statistics show:
"Supply Yes"
"Online Yes"
If it is not connected it shows:
"Supply Yes"
"Online No"
My problem is almost exactly like the one in this post:
Ubuntu 11.10 power management does not recognize removal of power supply
The only exception is that my system does not dual-boot with Windows. This is Ubuntu only. The computer in the other post is a Lenovo as well; not sure if that has anything to do with it.
Any help would be greatly appreciated. Thanks.
Best Answer
I have a Lenovo Z470 notebook and I found the same problem when installing Ubuntu 12.04 in dual boot with Windows 7. I'm not an expert on this field but I'll describe my experience (it might help).
I have found that some Lenovo laptops, including my own and I'm not sure which other models, include an utility named Lenovo Energy Management in Windows 7 that allows users to select whether to charge to 100% to maximize runtime, or charge only partially to maximize lifespan of the battery.
Here is what the utility looks like:![Screenshot of the Lenovo Energy Management utility in Windows](https://i.stack.imgur.com/LW2v0.png)
Pertaining this utility I have noticed two things:
Since most of us have already used this option at least once, I have found a workaround proposed in a thread in ubuntuforums.org proposed by member achilleas.k (not my credit). I'll cite:
This seemed to work for achilleas.k, some other users in that forum, and certainly is working for me. I know it's not a permanent solution, especially for those of us using both Ubuntu and Windows, but it sure helps meanwhile. Perhaps a more expert Linux user can help us out to find a formal solution using this info.
Hope it helps.