I have similar issue on Lenovo B50-70 with AMD/Intel graphics, Xubuntu. 
Switching to text console and back to Ctrl+Alt+F7 does restore cursor.
I have also noted that 
1. Disabling discrete AMD card in BIOS this issue still persists.
2. After waking from lock/suspend there is cursor in unlock screen but cursor 
disappears after session is unlocked

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https://bugs.launchpad.net/bugs/1568604

Title:
  Mouse cursor lost when unlocking

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