Sleep option under power greyed out

The sleep option under plugged in is greyed out. That same option is
functional under battery. I have checked all options in the advanced settings
and they too do not permit a setting for sleep on plugged in mode.

Thanks,
--
NJF

You either need to install the latest graphics drivers, chipset drivers, or
both. Go to the manufacturer's website of the computer to get them. If
your computer is a self-built PC, you will need to go to the motherboard's
and graphics card's respective websites for them.