I have an ASUS K53E. The battery reports a capacity of about 76.5%, i.e 43.8 Wh of 57.2 Wh.
Since upgrading to Ubuntu 14.04, my laptops suddenly turns off: no suspend, hibernate or gracefully shut down, but a drastic lost of power...
This happens when my laptop still reports more than 20% of charge. It seems that I need to mentally subtract the 100% - 76.5% = 23.5% to see that I need to plug my laptop...
Does anyone else has reported this issue?