Just to add: closing the laptop lid (and waking up) works fine if I've logged out of Xfce (and am at the LightDM login screen), so it seems to be an issue with Xfce/Xubuntu. Thanks.
Just to add: closing the laptop lid (and waking up) works fine if I've logged out of Xfce (and am at the LightDM login screen), so it seems to be an issue with Xfce/Xubuntu. Thanks.