While suspended timers like sleep is suspended too. If you want to make software that does something while suspended, you should use https://github.com/nemomobile/libiphb as that is currently the only thing which periodically can be used to wake from suspend. In the future we might offer somekind of Qt/QML API, bug no eta avail currently. Having said that, please avoid using that, as we really want to save power and not have too many apps waking up from suspend periodically