The trick here should help you.
https://github.com/ArcticaProject/nx-libs/issues/671

 It works for me. I opened a terminal after login and issued the xset command:
https://github.com/ArcticaProject/nx-libs/issues/671#issuecomment-370715419

2018. 03. 7, szerda keltezéssel 10.37-kor martti pitkanen ezt írta:

I have Linuxmint 18.3 and the same problem.