I'm aware of the question asked and answered about Redshift/F.lux but it doesn't seem to work for me, as I have Intel HD Graphics. I can open F.lux and preview but for some reason it has no effect on the screen. I tried it with Redshift and the same thing happens, it has no effect on the display. Why aren't they working for Intel HD Graphics? I have Intel HD Graphics 520 by the way.
Edit: It seems to be a Unity issue? I'm using Kubuntu now (which uses KDE Plasma) and the problem seems to be fixed. It will still be nice to know why Redshift/F.lux isn't working on Unity.