I have made a pretty big jump from Windows 7 to Windows 11 in last few months. On Windows 11 I am experiencing the same thing and it's killing my eyes. In my case, f.lux gets disabled once the system receives a notification which usually comes from Outlook in my case (new mail). After few seconds, the colors are back to yellow automatically, but this quick moment is enough to receive a deadly dose of the blue light in the evening, I have never experienced it working on Windows Vista & 7 for 15+ years.

@Burgerkrieg I think I figured it out, at least in my case. Checking "Always use Windows internal color table" fixed it for the misbehaving monitor, which was otherwise doing exactly what yours was.

@herf Yes, they support HDR. To be specific they are both an Acer Nitro 27".

Additionally, I am using Windows 11's Auto HDR setting. Which, to my understanding, changes a display to SDR if the content (or just games? That is all I see it with at least) does not support HDR.

@Chikins the ones we read say "VCGT profile=1" so it is not a full profile in this case.

@tyealia yes the DisplayLink device is forcing them all to use the same settings because the USB adapter has disabled color settings. See if this post helps: https://forum.justgetflux.com/topic/3629/displaylink

@jeffb the main thing to check is that the "correct" color profile is used for the mac monitor (it should say "Color LCD" the System Preferences > Displays > color)

Also, we did make an update a few years ago to support DCI-P3 displays (like the new Macbooks), so make sure your f.lux build is up to date also.

@cjmanca can you post f.lux options > driver info?

My machine here doesn't appear to notice this case (even when I unplug the second monitor) so I want to figure out what's going on there.

@macroarray I think it may be based on this sample, which is up near 50,000K: https://fluxometer.com/rainbow/#!id=Outdoors/Blue Sky LA 2PM

This is especially blue but it is common to find the blue sky at 20,000-30,000K. CCT does go up dramatically as things get bluer, it's approximately 1/linear.

Most meters will only say CCT in a particular range (e.g., our measurement software goes to 100,000) - maybe the number is too large for this meter to report...

@herf I agree and disagree. It makes sense to have a small white patch to see. However most apps I use have darkmode, which makes the "right color choice" the one fitting darkmode-apps :)

@herf Awesome appreciate it! 👍

@zero00 we have had better luck with DisplayLink or native (thunderbolt or displayport) connections. I should ask if this monitor has worked in the past for you with dimming controls?

@VitaAurum777 this is in our very-beta root-only build for Android, but it is not really maintained for current devices.