Laptop Power Management - Not Available

I installed 8.1 in my inspiron 5000 and I get a little icon which looks like a battery with a red "X" in top of it. It says that Power Managemet tools are not available. The first time I installed I choose the "install" option from the menu, after that I installed it again with the "install acpi". Am I missing something? RR --------------------------------- Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now