@fckflux Lol, happened to see your reply a little late perhaps. I see your username and that's hilarious, why bother using f.lux anyways man you have a laptop with brightness hotkeys to change your brightness so no need! Also just use Windows night mode or use LightBulb instead for christ sike. Dude's probably still complaining about his washed out color's, sheeeeeeit if necessary reinstall darn Windows! Then simple don't ever reinstall f.lux on that laptop. Not hard.
I stand by F.lux and have been using it for years no problem with AMD & Nvidia GPU's, all kinds of different hardware. But hopefully by now you've already fixed your issue...
What really gets me is when you say "7 years later this issue still persists." I'm uncertain as to what to think about that. Do you mean you've been dealing with this same issue after installing F.lux from 7 years ago? If so dude, maybe you should get a new laptop. LMAO. But If I think what you really meant is that you've seen other threads from people 7 years ago with this same problem then that would obviously make more sense.