I believe you are experiencing the following issue: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/149547
Please check to see if you are having similar results and post to that bug report your hardware specifications.
I believe you are experiencing the following issue: https:/ /bugs.launchpad .net/ubuntu/ +source/ gnome-power- manager/ +bug/149547
Please check to see if you are having similar results and post to that bug report your hardware specifications.