Comment 54 for bug 1573454

This is long standing problem with Light-locker or graphical driver. The cursor will disappear even if you lock and unlock screen.

Solution which works well for me is to replace light-locker by xscreensaver:

sudo apt-get uninstall light-locker
sudo apt-get install xscreensaver

If the problem on resume persists, enable screen lock when system going for sleep. (xubuntu 16.04)