I think I may have come across a bug with Antergos. I installed kde 4.15 and my power settings did not work (turn off monitor at five minutes). I updated to Plasma 5.2 with the same issue. I started over with Cinnamon only to have my monitor on with Power Management settings ignored. I decided to try Gnome with the same issue.
The Monitor should shut off at the 5 minute mark. As way of comparison, I tried Fedora 21 with Cinnamon, Opensuse 13.2 with kde and Mint 17.1. All three distors shut the monitor off at 5 minutes. I’m not sure what is going on, but I need to have the Power Settings work.
Has anyone else noticed the issue and more importantly, is there anything that can be done to address the issue? I prefer to stay with Antergos, but am now using Mint 17.1 as my monitor turns off at the 5 minute mark, as it should.