I like to avoid to much blue light in the evening. F.Lux doesn’t work anymore.
Any suggestion for an alternative?
Have you tried Redshift?
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The company offer a tech support page at
But cannot see any references to your question
I would be tempted to look at your settings for the screen and if it is a Nvidia issue over controlling a setting
Never used this product so no other options of software, I just turn the brightness down manually to suit general light conditions
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i don’t use any of the above, but found some other options listed here:
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Thank you all for teh suggestions. I will try them out 
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Redshift works good for me and is still under development.
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For so far I can see it doesn’t work on Xubuntu, but now I’m using iris-mini-0.3.8.AppImage and it’s working fine .
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