Acer A3-A10 - Manual (Page 18)

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Waking your tablet
If the screen is off and the tablet does not react to any taps on the screen, then
it has been locked and is in sleep mode.
To wake your tablet, press the power button. Your tablet will display the Lock
screen. To unlock the screen, tap the lock button and drag it in any direction
until it turns white and displays the unlocked icon.
Adjusting Touch WakeApp settings
1. Pull down the status and settings panel.
2. Tap the Touch WakeApp icon to display the Gesture Configuration options.
3. Tap ON to enable the function you want to activate.
4. Tap the item you have enabled (2-thumb or 5-finger gesture) to bring up the
app list.
Note: Hold the tablet with both thumbs near the edge of the screen to
wake up your tablet.
5. Select your app and Tap OK.