I found the problem also, using latest stable xubuntu 14.04, on diferent
computers(Lenovo, Asus, Schenker...)
Close lid with or without locking enabled, but always turning to standby
Afteropening, mouse pointer is invisible.
My current solution ist to do STRG-ALT-F1 once, then directly going back
I found that the process of removing nvidia driver / returning to nouveau is
prevented by a running service (nvidia-persistenced).
to get rid of the proprietary driver, do: "sudo kill " and then
you can use the hardware driver dialog to return to nouveau.
To find the id just do "ps -e | grep nvid
