Hey, I know this topic is a bit old, however I ran into the same issue today and I would like to share this fix I found for anyone who follows.
To block f.lux from keeping the PC awake, but still allow it to control your Hue lights when the PC is on, open a command prompt window in administrator mode by opening the search bar (Windows 10), searching for "command" and right clicking the command prompt and selecting "Run as administrator". Next, in the command window, type these two commands (confirm each by pressing enter):
powercfg /requestsoverride PROCESS flux.exe SYSTEM
powercfg /requestsoverride PROCESS flux.exe AWAYMODE

After that, f.lux should no longer prevent your PC from entering sleep mode.

Hope this helps!

Hey, I know this topic is a bit old but I ran into the same issue today and I would like to share this "fix" I found for anyone who follows.
To block f.lux from keeping the PC awake, but still allow it to control your Hue lights when the PC is on, open a command prompt window in administrator mode by opening the search bar (Windows 10), searching for "command" and right clicking the command prompt and selecting "Run as administrator". Next, in the command window, type these two commands (confirm each by pressing enter):
powercfg /requestsoverride PROCESS flux.exe SYSTEM
powercfg /requestsoverride PROCESS flux.exe AWAYMODE

After that, f.lux should no longer prevent your PC from entering sleep mode.

Hope this helps!

Hey, I know this topic is a bit old but I ran into the same issue today and I would like to share this "fix" I found for anyone who follows.
To block f.lux from keeping the PC awake, but still allow it to control your Hue lights when the PC is on, open a command prompt window in administrator mode by opening the search bar (Windows 10), searching for "command" and right clicking the command prompt and selecting "Run as administrator". Next, in the command window, type these two commands (confirm each by pressing enter):
powercfg /requestsoverride PROCESS flux.exe SYSTEM
powercfg /requestsoverride PROCESS flux.exe AWAYMODE

After that, f.lux should no longer prevent your PC from entering sleep mode.

Hope this helps!

You're welcome. I love f.lux and I always love meeting others who love it too! I am confident that you'll find settings that work for you so that when you are ready to go to sleep, you actually feel ready. If you don't feel ready when you want to be, then of course there are always numerous possible culprits (ranging from lifestyle, diet, chosen activity near bedtime, lack of exercise, stress level, etc., etc., etc.) - but one possible culprit in today's world is being exposed to too much blue light too close to bedtime. Like 100 years ago, that was never an issue. lol If it weren't for f.lux, no one would be able to safely use their computer right up until bedtime, and those people who are using f.lux today would otherwise still be wondering why they can't go right to sleep after they turn their computer off.

Of course, you still have to make sure your indoor lighting isn't too bright and blue. After all, what good is f.lux in a home that's lit by bright "Daylight" lights and super bright vanity lights in the bathroom, etc.? :) I use extremely low light at night. I also have a dimmer in the bathroom and brush my teeth and whatnot in a dimly-lit bathroom. I suppose if someone saw how I live during the last couple hours of my day, they'd think I'm a little crazy.

Has this ever been resolved? I just started having this issue this week, but my entire UI has changed, so I think I was just updated to v4. Thanks!

This is still an issue. Is there any info, if this will be fixed?

@deckinghalls and @DaaBoss If you are having problems can you post or PM me your video drivers version and system information so we can keep track of issues like this? Thanks very much.

Hi @lakeside - can you try reinstalling and uninstalling from our website? It sounds like f.lux did not uninstall properly. And also, there is an uninstaller fix in the new version.

Also, occasionally there is an issue because we try to load color profiles, and often they are not loaded at all by Windows 7. So if uninstalling doesn't help, you might also check the Color Management control panel to see what is in there.

I'm on a Mac, but I'd also like to see this. If I'm watching a movie or doing something in Photoshop on one screen, I still want to f.lux to be active for the other one.

@herf I also wanted to say, thank you for the quick response. I've had some support take days to respond to a problem. Top notch work.

We do have kind of a complicated state model that considers how long it's been disabled, but we can always do better.

Check out the notes here:

https://forum.justgetflux.com/topic/4653/tinted-screenshots-or-fullscreen-apps-and-games-missing-f-lux

No, because the only time it's using any system resources is when it's adjusting to a different color. So, the only way it can increase battery power usage is if you're frequently changing the color temperature (and/or color effects).

Once it's set to a color or color effect, it's no longer using any system resources and therefore not using any extra battery power. It's not actually using any system resources in order to maintain the color temperature or color effect.

Okay, it did happen again - so changing the earliest wake time wasn't it. After posting, I had also updated the driver to the newest one (390.77) available for Quadro.

If f.lux tries to disable for remote stuff, and that's causing issues here, shouldn't it be off rather than in stuck in Sunset mode? Other than this issue, it seems to work fine for me.