wake up from sleep ?

Hi guys.. remix OS is almost perfect for me most of problems has been solved but after sleep I can't unlock the screen
I have dell XPS 12 i don't have keyboard and I don't use mouse but
When i press windows button from the tablet ( working as home button before sleep) nothing happened and power button not working in any statement
Actually in stock android-x86 the power button works but it has the same problem in sleep .. even when press the power button still black screen

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