powersaving/screensaver UnInhibit method times out over DBus

[Paulius Vitkus]

I use Inhibit/UnInhibit methods over dbus (name: 'org.freedesktop.ScreenSaver', path: '/ScreenSaver', interface: 'org.freedesktop.ScreenSaver') to control computers power saving. In Trusty (14.04) everything works fine. In Utopic (14.10) I noticed that UnInhibit delays its reply for about 25 seconds.
Tested using python-dbus and GDBus from python-gi. When calling this method synchronously with default timeout I get an error (NoReply). This kind of behavior can brake many applications dependent on this functionality.
Increasing timeout over 25 seconds seems to help but it is a long time for application to freeze. Calling method with noreply flag helps to execute UnInhibit instantly from applications side but next call to Inhibit still delays.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Andreas Angerer (andreas-angerer89)]

Same here on Utupic. Interestingly enough calling inhibit seems to be working just fine, only uninhibiting is buggy.

As a result programs like caffeine don't work any more as well.

[Alexander (aheihachi)]

Caffeine plus doesn't work correctly for me either.