How do you disable the screensaver/powersave function in Ubuntu 18.04?

In Ubuntu 16, you disabled the screensaver in two steps:

  1. First, opening the screensaver gui and selecting "none". But this alone didn't stop the monitor from blanking.
  2. The X server had its own powersave feature that would turn off monitor output when nothing on the screen changed. To disable that, you had to run xset s off.

In Ubuntu 18.04, the second part no longer works. Even though I've run xset s off, my monitor output still blanks if nothing changes after a few minutes. How do I fix that?

I'm running the XFCE desktop, with the xubuntu-desktop package, if that matters.

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