Night Shift Color Temperature Behaviour

Thanks for your response. I'm puzzled by what you say:

"Being able to adjust the slider is expected whether the Night Shift option is selected"

If that is the case, then Night Shift seems to serve no function, and Apple contradicts this idea in their own words here:

"Drag the slider to make the color temperature more or less warm when Night Shift is on."

But in my case, dragging the slider makes the color temperature more or less warm when Night Shift is off (or on)

Perhaps even more perplexing is another statement that Apple makes:

"Night Shift automatically shifts the colors of your display to the warmer end of the color spectrum after dark"

(source: https://support.apple.com/en-us/HT207513)

But, again, it seems to be the case that this adjustment happens not automatically, but only manually. When I activate Night Shift there is no discernible difference whatsoever, regardless of whether I adjust manually or by schedule Night Shift to come on.

Thanks again for your response. I'm not sure if I explained my issue clearly, so I'll just outline the steps of what I'm doing, and the affects I'm seeing (or not seeing)

1. Schedule is set to "Off"
2. Manual left unchecked
3. (Steps 1 & 2 indicate to me that Night Shift is "off")
4. I adjust the slider all the way to the left – to "Less Warm" (and can see, as expected, a difference in the display)
5. I then select "Manual" – which indicates to me that Night Shift is now "on" and therefore should affect a visible difference in my display
6. I see no difference in my display whatsoever – the display remains visually identical as it was at step 3 (when Night Shift was "off")
7. Therefore, though Night Shift is now "on" I see no visual difference, hence I cannot conclude that Night Shift is working. There is no appreciable affect on my display whether Night Shift is "off" or "on"

I can do the same steps, but at step #4 I adjust the slider all the way to the right – to "More Warm" – and the result is the same: (i.e., though Night Shift is now "on" I see no visual difference, hence I cannot conclude that Night Shift is working).

I've also experimented by setting the Schedule to five minutes ahead of the present time: and can see no visual difference once the time indicated in the Schedule has arrived: my display remains exactly as it was before the scheduled time arrives.

I hope that explains what I'm encountering.

Hello.

Thanks for your response. I tried as you suggested, but unfortunately, my slider setting does not default to the native color temperature of the display, but stick to the color associated with whatever position I have left the slider at (with Night Shift set to Off).

I am not using Flux or Night Owl. But after running the command you provided, I recalled that I did have a similar application installed "Brightness Slider" but I uninstalled it and re-ran the plist command to no avail.

Thanks anyway.

Thanks again. I don't have a Time Machine or anything with which to back up, so I think this is something I'll just have to live with.

Sure.

Yes, I'm fully aware that I can install without backup. It has been my displeasure to do so once already in the past – though the displeasure was relatively mild. As long as I can access my Dropbox files, whatever else I lose is largely inconsequential.

As per "begging the question" (a phrase which doesn't actually mean what you intend it to mean, but refers instead to the Aristotelian notion of "informal fallacy") – I've been pretty lucky in my 18 plus years of Apple usage, but their products seem to be decreasing in their stability. But perhaps this instability is due more to the changes in computing tout court – rather than any shortcoming in Apple's products. Whatever the case, I'm finding it increasingly difficult to justify both their high purchase price and their usage in general. Their motto used to be "It just works" – and indeed that was the case formerly. Not so much any more.

I'll likely get an external drive some day. If only the good lord had decided to give us 25 hours in a day rather than the relatively paltry 24 – then I would have the time to do so.