Configure your device to wake on touch
In some scenarios, you want your device's screen to turn off while not in use and to turn on quickly when a user touches the touchscreen. This document describes how to configure your device to achieve this scenario.
Setting a video idle timeout
You can configure the screen to turn off after a period of inactivity by setting a video idle timeout. When the user has not interacted with the device for a specified length of time, the screen will turn off. This will enable the device to enter a low-power state by powering down components related to the display.
powercfg.exe /setacvalueindex SCHEME_CURRENT SUB_VIDEO VIDEOIDLE 10 powercfg.exe /setdcvalueindex SCHEME_CURRENT SUB_VIDEO VIDEOIDLE 10 powercfg.exe /setactive SCHEME_CURRENT
Disabling modern standby
On AoAC systems (which includes all ARM systems), the system will automatically enter modern standby when the display goes off. When a system is in modern standby, it can only be woken by certain inputs. This is not an exhaustive list, but these inputs include pressing the power button or receiving mouse input. Touching the screen will not wake up the device from modern standby. If you want your Windows 10 IoT Core device to wake up by touch, you have to configure the device not to enter modern standby. To disable modern standby, set the following registry key and reboot.
reg add HKLM\System\CurrentControlSet\Control\Power /v PlatformAoAcOverride /t REG_DWORD /d 0
Disabling modern standby can impact power consumption when the system is idle. You should measure your system's power consumption with modern standby enabled and disabled before making the decision to disable modern standby.
Modern standby is a software mechanism that attempts to quiet system activity as much as possible, thereby allowing hardware to enter a low-power state. In theory, a sufficiently quiet device with modern standby disabled can achieve the same low power consumption as a device in modern standby depending on how you have configured OS services and the capabilities of your SoC. For example, very quiet static configurations as described here have been shipped with the QC 410c and Windows 10 IoT Core. It is important to minimize background activity including software timers and periodic tasks if modern standby is disabled.