Colour temp - possible to set 100% manually?

There are threads here about this already - but the search revealed no threads that had info about using the apps for minimizing blue light exposure for different schedules like mine or in any 100% manually controlled ways.

I've tried both Redshift & F.lux & the trick using Gnome Tweak besides, but came into 2 serious problems for me to use any of 'em - namely...

1 - I mostly live a 3rd shift life, and sleep during daylight hours - as in from around sunup 'till 3PM EDT in a fully darkened room;

2 - Ubuntu Mate 18.04.5 seems to fight with these types of apps.
(Yes, I know I'm out of date & hope to upgrade before next week...)

Aside of these vexations, the OS's built-in screen temp adjustment thingy doesn't seem to work at all.

I found lat & long coordinates for McMurdo Station in Alaska:
-77.9527, 166.4895
And presently do use those with f.lux - but it is still not very useful schedule-wise for me.

I also joined & posted my query at the f.lux forum, to no avail.

Emailed the devs of Redshift & gammy as well with my query - no reply from either.

In a perfect world, it would be possible to use something like a tray icon like f.lux has to just switch between unshifted & ~2700k at will, but if such a thing exists I have not found it.

For my situation it would mostly be OK to have it set to ~2700k all the time.

This would be really simple if my display had such a feature built in - but sadly it does not.

Any helpful suggestions will be HUGELY appreciated !!


Hi @computerguy :slight_smile:

Maybe it will help adding this to your redshift config file :


This should keep a soft colors all day long.

Lower will be the temp inside this configuration, more the screen will be "red" :new_moon: :red_circle:

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YAY !! Thanks Very Much Olek !!!

I looked for all config options and found this:

Then made the file as described, which has this inside it:

; Enable/Disable a smooth transition between day and night
; 0 will cause a direct change from day to night screen temperature.
; 1 will gradually increase or decrease the screen temperature.
; Set the screen brightness. Default is 1.0.
; It is also possible to use different settings for day and night
; since version 1.8.


I'll likely try some various settings, but for now this is very, very good & easily disabled instantly if/when I want that colour temp & brightness.

Thanks Again !!

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