Screen gets warmer when adjusting brightness



  • Recently, I moved to Windows 10 (10240) and of course, one of the first apps I installed was my good old f.lux. Unfortunately, I discovered that now, when I lower the monitor brightness using Alt + Pg Down, the screen gets warmer back to normal. It's true that with previous versions, it was difficult to see anything with the lowest levels, but now it's really useless if I must choose between a dimmed backlight or more convenient temperature. Is there any way to change this to the old behaviour? Everything else is working flawlessly.



  • I don't understand; it's supposed to get warmer when you press Alt+Page Down.



  • I thought it was only supposed to dim the backlight, not change the temperature.

    At least that's how it worked in previous versions. Also, the option in "Extras" says:
    Use hotkeys (Alt-PgDn, Alt-PgUp, Alt-End) to control brightness
    so only brightness control :)

    Also 2, I have disabled the previous setting:
    Make screen warmer as your backlight dims



  • Oh, that option is for laptops and tablets. When you have that option selected on a laptop or a tablet, dimming the monitor using the laptop's or tablet's controls will also result in a warmer color. It has no relation to Alt+Page Down or Alt+Page Up.

    The warming with Alt+Page Down is the way it's supposed to be and it's the way that it has always been. The reasoning behind it is, light naturally becomes warmer when it is dimmed, and so it would be unnatural if the color temperature stayed the same when using Alt+Page Down.

    I was here back when Lorna and Michael introduced these "Extras", and Lorna told me that this is normal and she gave me the same explanation that i just gave you. When you dim light, the color temperature becomes warmer. That's why Alt+Page Down results in a warmer color.

    In other words, the only thing that we can tell you is that if you don't like the way Alt+Page Down works, then you shouldn't use it.

    I think what your experiencing though is, you're paying MUCH closer attention to everything now due to how new Windows 10 is to you, and so you're finally noticing that Alt+Page Down results in a warmer color temperature.

    I personally like it. I take full advantage of it at night. When I'm getting ready for bed, I choose 1200K, and then I dim my monitor all the way to its lowest setting. Then, I use Alt+Page Down to dim it even further (albeit, this is an artificial dimming) so that I can also have a temperature that's even warmer than 1200K. You see, at night when I'm in my bedtime routine, I switch to red CFLs. Seriously, dim red CFLs. It's absolutely fantastic.


  • f.lux team

    You can turn this feature off - it's the first item in the Extras menu.

    We try to model how an incandescent light gets warmer as you dim it, but at the more extreme settings it can make things harder to read.



  • But with it turned off, Alt+Page Down still changes to a warmer color temperature.



  • @TwoCables Thank you so much for your kindness and thorough explanation! Even though I'd bet it used to keep the temperature when dimming.... maybe it was an old instance of f.lux.

    @herf I thought this option would work this way, but apparently, it doesn't. It's such a pity, since I like using my PC a bit at night with the lights off, and a dimmed and colder screen is more easy for my eyes. Guess I'll have to look for a new way to do this, will investigate AutoHotkey :)

    Again, thank you both!



  • I think that Herf misunderstood. These two options aren't related. The one for warming the display as you dim it is for a laptop's or a tablet's built-in dimming options. Changing the brightness using Alt+Page Up and Alt+Page Down has always adjusted the color temperature since it was added to f.lux. Like i said, I've been around on here even before then. I was here when they added it and I remember them asking all of us what we thought of it.

    So this is just the way it works and it's the way that it has always worked. ;)


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