Enable missing power profiles (Power Saver/High Performance)

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If you disable connected standby all Windows power plans are displayed and all advanced power functions are available.

Use Regedit and change the below:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power
Change the value of the key CsEnabled from 1 to 0 and reboot.

1 means connected standby enabled and 0 disabled.

Found at (http://en.community.dell.com/support-forums/mobile-devices/f/4586/t/19578910)