Preventing automatic system suspend (PC)

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The Problem

My system is going into suspend after about 10 - 15min idle time. I'm running out of options on preventing systemd from going into suspend. It's not a notebook, but my workstation PC running Fedora 20.

The Setup

• I'm running XMonad only, but logging in via Fedoras default display manager: GDM
• When logging in, I'm starting xmonad with connecting to the session bus: xsession file on github

What I've tried so far:

• I'm using the xfce4-power-manager to inhibit suspend: systemd-inhibit shows one inhibitor for going into suspend:

  $ systemd-inhibit
  Who: xfce4-power-manager (UID 1000/rjoost, PID 8916/xfce4-power-man)
  What: handle-power-key:handle-suspend-key:handle-hibernate-key:handle-lid-switch
  Why: xfce4-power-manager handles these events
  Mode: block
  

  yet to no avail.

• it seems logind correctly tracks my session as well, since I see my user listed when using loginctl

• I can see quite a few additional sessions started when checking /var/log/messages and wonder if this is part of the problem:

   Feb 28 11:55:01 donbot systemd: Starting Session 109 of user root.
   Feb 28 11:55:01 donbot systemd: Started Session 109 of user root.
  

• I've also commented out /etc/systemd/logind.conf to:

   IdleAction=ignore
  

  but I think this is already the default, so it won't matter wether it's a comment or not.

• I'm using xautolock with xlock. I wonder if the X.org DPMS setting has somewhat something to do with the system going to sleep. Asking a colleague with more understanding of the guts of X.org, this doesn't seem to be the case, but I thought I mention it. (Kudos to Peter Hutterer for helping me here) xsession file on github

My Question:

Any help to:

• prevent the system going to sleep
• diagnose why the inhibitors do not inhibit suspend