Hi Everybody,
My problem is solved after 2 years of using Windows 10 x64 on my ASUS Zenbook UX301LA following the next link from
http://drivers.softpedia.com/downloadTag/Smart%20Connect%20Technology
So I have chosen a more or less similar ultrabook (ASUS ZENBOOK UX302LA) and was praying to God, that this driver (Windows 8.1 x64) Intel Smart Connect Technology Driver 4.2.41.25492015-05-11
SmartConnect_Intel_Win8_64_VER42412633
would "go up" (installed/accepted), but it was accepted and installed by Windows 10 x64. And the problem was solved promptly: during 2 years e.g. the "sleep" mode really had not worked. If I put to "sleep" and pressed any button or the Power button, nothing happened and I had to press the Power button 5-8 seconds and restart the ultrabook again.
Because, as we all know, Intel did not update these drivers for Windows 10. But if you find a driver more or less similar to your HW/notebook, you may download that driver (Windows 8) and perhaps you have the chance, that this will work. I already changed the Power Options in my settings to use the sleep and tried it with various modes: pressed the power button, put to sleep mode with start button etc. And, for the time being, it works.
Good luck to you and have fun!