New answers tagged sensors
I find the solution, according to here, I turned off auto rotate and turned off tablet for about ten minutes, then turn it on again and now g sensor works!
I don't know if this suits you but what about a power plug with a movement sensor? When it detects movement, the tablet will get the power connected and the screen will turn on. Plus with Tasker you can configure much more things to do when it detects movement.
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