I'm using Xubuntu 14.04 on a mid 2010 Macbook. Has had this issue and had to restart lightdm using `sudo service lightdm restart` every time. But have just noticed that if I open the lid, get the dark screen, then close the lid again and reopen it once again, the session gets restored. No lightdm restarting any more!
I'm using Xubuntu 14.04 on a mid 2010 Macbook. Has had this issue and had to restart lightdm using `sudo service lightdm restart` every time. But have just noticed that if I open the lid, get the dark screen, then close the lid again and reopen it once again, the session gets restored. No lightdm restarting any more!