bug: f.lux does not remove the orange tint from screens that was inactive when entering sleep mode

lathans

Hi!

Issue: Screen remains tinted orange in daytime after waking computer from sleep if the screen was tinted and disconnected/set inactive before entering sleep mode.

Setup: PC with two displays connected. In my case, one computer monitor and one TV. Just one active display at the time ("PC screen only" or "second screen only").

To replicate the issue:

Use the computer in the evening with the orange tint from f.lux
Change active display to a second monitor (turning on my TV in my case)
Set Windows to sleep
Disconnect the second monitor (turning off the TV in my case)
Wake the computer the next day
The first display that I used in step 1 is still tinted orange
Nothing seems to remove the orange tint other than closing f.lux and opening f.lux again. Closing f.lux and then launching it again solves the problem.

Doing it the other way around also make the issue appear on the other display: Using the TV in the evening with orange tint, turning off the TV, using the computer monitor, let Windows go to sleep, waking up in the daytime, turning on the TV and waking the PC, and the TV remains tinted orange until I exit and start f.lux again.

I guess f.lux should check if the time has changed from night time to daytime when Windows wakes from sleep and clear the orange tint from the monitor even if the active display is different from which display that was active the moment before Windows went to sleep.

Let me know if you need more information. Thanks!

Driver info follows below:

Virtual Desktop, Inc. 13.50.53.699: Virtual Desktop Monitor (20240521)
Meta Inc. 17.12.55.198: Meta Virtual Monitor (20230328)
NVIDIA 32.0.15.6109: NVIDIA GeForce RTX 4090 (20240905)

Generic PnP Monitor, 598 x 336mm, built 2014
Chromaticities: 
  R=0.645508 0.343750
  G=0.315430 0.625000
  B=0.139648 0.044922
  W=0.312500 0.329102
  sRGB gamut: 91%, AdobeRGB gamut: 64%

Generic PnP Monitor, 698 x 393mm, built 2021
Chromaticities: 
  R=0.650391 0.335938
  G=0.318359 0.603516
  B=0.148438 0.054688
  W=0.313477 0.329102
  sRGB gamut: 87%, AdobeRGB gamut: 60%

Unlimited gamma ramp=1, Internal ramp=0
Monitor 1 on NVIDIA GeForce RTX 4090
  Has VCGT profile=0, Gamma Ramp works=1

Windows Build: 22631.4317