The display must turn off after 20 minutes of inactivity when the system is running on battery.

From Windows 8 Security Technical Implementation Guide

Associated with IA controls: ECSC-1

SV-48313r1_rule The display must turn off after 20 minutes of inactivity when the system is running on battery.

Vulnerability discussion

Turning off an inactive display supports energy saving initiatives. It may also extend availability on systems running on a battery.

Check content

Fix text

Configure the policy value for Computer Configuration -> Administrative Templates -> System -> Power Management -> Video and Display Settings -> "Turn Off the Display (On Battery)" to "Enabled" with "1200" seconds or less.

Pro Tips

Lavender hyperlinks in small type off to the right (of CSS class id, if you view the page source) point to globally unique URIs for each document and item. Copy the link location and paste anywhere you need to talk unambiguously about these things.

You can obtain data about documents and items in other formats. Simply provide an HTTP header Accept: text/turtle or Accept: application/rdf+xml.