Silvans Fix (https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/555122/comments/28) worked for me. My laptop is also an HP Elitebook 8530w with nVIDIA Quadro.
Silvans Fix (https:/ /bugs.launchpad .net/ubuntu/ +source/ gnome-power- manager/ +bug/555122/ comments/ 28) worked for me. My laptop is also an HP Elitebook 8530w with nVIDIA Quadro.