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  • It might be your desktop environment imposing its own configuration. What desktop environment are you using? Do you have the same problem with a different account using a different desktop environment? Commented Jun 27, 2016 at 21:22
  • I am using Gnome 3.20.2, updated the question. I don't have any other desktop manager installed, but I tried in a Gnome Wayland session. In Wayland, the same xrandr command produces no visible output, not even a flicker of the screen as previously. Commented Jun 28, 2016 at 2:28
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    ´xrandr´ shouldnt affect a Wayland desktop because its not an x server. Well, it might if the Wayland session is run atop an x server, which i guess might explain the flash you mentioned in a comment on the other question. Commented Jun 29, 2016 at 3:42
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    @mikeserv Thanks for explaining why xrandr is not affecting the Wayland desktop session. The flash I am seeing is only happening in the Gnome and Gnome Classic session, which I guess both run the xserver. I still don't understand what is causing the flash and preventing the xrandr changes from persisting. Commented Jun 29, 2016 at 13:41