After upgrade to Ubuntu 16.04 I recognized that
pm-utils are not used anymore to
suspend/resume my notebook. The change was already done with Ubuntu 15.04, but I
haven’t recognized it before, because everything was working like expected. I
recognized it these days after I changed my windowmanager to i3wm.
Since Ubuntu 15.04 they don’t use the
pm-suspend any more.
They use now systemctl commands to suspend if the lid is closed. Therefore my
screenlock was not working any more and I had to adapt some things to get the
i3lock to work.