POWER MANAGEMENT - Acer Iconia W3

This computer has a built-in power management unit that monitors system activity. System activity refers to any activity involving one or more of the following devices: keyboard, mouse, hard disk, peripherals connected to the computer, and video memory. If no activity is detected for a period of time, the computer stops some or all of these devices in order to conserve energy.

Saving power
Disable Fast startup
Your computer uses Fast startup to start quickly, but also uses a small amount of power to check for signals to start. These checks will slowly drain your computer’s battery.
If you prefer to reduce your computer’s power requirements and environmental impact, turn off Fast startup:
Note: If Fast startup is off, your computer will take longer to start from Sleep. 
Your computer will also not start if it receives an instruction to start over a network (Wake on LAN).
1. Open the Desktop.
2. Click Power Options in the Notification area.
3. Select More Power Options.

4. Select Choose what the power buttons do.
5. To access Shutdown Settings, select Change settings that are currently unavailable.

6. Scroll down and disable Turn on fast startup.

7. Select Save changes.