The keyboard and mouse sometimes stop working on my Lenovo Yoga due to a bug with the ymc service + related device orientation sensor. The purpose of the service is to automatically disable the keyboard + mouse while the device is being used as a tablet so pressing keys/touchpad doesn't interfere with whatever you're doing.
However, for some reason these relatively important input devices seem to enjoy disabling themselves randomly during normal use.
Here's a 'hotfix':
1. create 2 files, ymcstop.bat & ymcstart.bat
2. open with text editor and type 'net stop ymc' and 'net start ymc', respectively (without quotes), then save
3. place a shortcut in C:\Users\Will\AppData\Roaming\Microsoft\Windows\Start Menu\Programs to each file (replace Will with your username)
4. right click and change the icon to something you like
5. press start and type 'ymc' - now right click on each (start and stop) and 'Pin to Start'
If the keyboard/mouse ever stop working, simply press the windows icon (or slide from the right) to get to the start screen and press the ymcstop you created. If you want to re-enable the service (which disables the keyboard for tablet use), simply do the same but click the ymcstart you created.
Hope this helps!
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