Comment 11 for bug 1322275

Hello, here's what I did on my Xubuntu installation that seems to work:

In this file:
/etc/xdg/xdg-xubuntu/lightdm/

In line 27, in a default installation, it reads:
show-indicators=power;~session;~language;~a11y;~power;

Remove the first "power" entry, leaving only the built-in indicators:
show-indicators=~session;~language;~a11y;~power;

Save the file, and any subsequent lock screens and the processes they spawn should now exit properly upon screen unlock.

I can't say for sure why it solves the issue on my Xubuntu, but I suspect that trying to include two power indicators might cause one or the other to prevent lightdm's indicator services instance from properly terminating.

Can you see if this solves the issue on your computers?