Created attachment 184698 [details] [review]
Lock screen when upower signals

Currently, g-p-m locks the screen when it triggers a suspend or hibernate, as appropriate.  But sleeps initiated outside of g-p-m do not have correct locking, because g-p-m doesn't notice.  I would argue that it should lock in reply to the Sleeping signal from upower, so that it will catch all suspensions.

There's a downstream Ubuntu bug about this that I will link.

Now, the Sleeping signal does not currently have enough information to tell g-p-m whether it is a suspend or hibernate.  I filed https://bugs.freedesktop.org/show_bug.cgi?id=35797 about that.

Assuming that patch is accepted, or something like it, here's a patch against g-p-m by Phillip Susi to respond to the signal.