Score:1

Ubuntu

How to make redshift even more red in Ubuntu MATE 22.04?

Archisman Panigrahi

2/12/24, 5:30 AM

I am using Ubuntu MATE 22.04. Towards night, redshift sets a color temperature of 4500K.

How to reduce the color temperature even further? Unlike the Night Light feature in GNOME/KDE, Redshift does not have any simple method to manually change the color temperature (but it might be configurable by editing redshift.conf, which is why I am asking this question).

361

1 + 4

colors

mate

redshift

ubuntu-mate

22.04

Terrance

2/12/24, 5:48 AM

I set mine to `3200K` in the `.config/redshift.conf` file on the `temp-night=` line.

guiverc

2/12/24, 5:52 AM

There is both a `temp-day` and `temp-night` setting... my choice is =3500, but `man redshift` provides a pretty good clue on my *lunar* box.

mchid

2/12/24, 6:09 AM

As you can see in [this answer](https://askubuntu.com/a/864845/167115), you can use the config file to set the temperature to something lower like 3500.

mchid

2/12/24, 6:17 AM

Using an edited version of the default configuration file, I have `[redshift]` and `temp-day=3400` and `temp-night=3400` and `transition=1` and `location-provider=manual` with the default `[manual]` and `lat=48.1` and `lon=11.6` All the other lines are commented out (with a `;` at the beginning of all commented out lines).

Score:2

Ubuntu

mchid

2/12/24, 6:37 AM

To expand (or to provide some contrast compared to the answer found in the duplicate post). Here's what I have in my ~/.config/redshift.conf file:

; Global settings for redshift
[redshift]
; Set the day and night screen temperatures
temp-day=3400
temp-night=3400

; 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.
transition=1

; Set the screen brightness. Default is 1.0.
;brightness=0.9
; It is also possible to use different settings for day and night
; since version 1.8.
;brightness-day=0.7
;brightness-night=0.4
; Set the screen gamma (for all colors, or each color channel
; individually)
;gamma=0.8
;gamma=0.8:0.7:0.8
; This can also be set individually for day and night since
; version 1.10.
;gamma-day=0.8:0.7:0.8
;gamma-night=0.6

; Set the location-provider: 'geoclue', 'geoclue2', 'manual'
; type 'redshift -l list' to see possible values.
; The location provider settings are in a different section.
location-provider=manual

; Set the adjustment-method: 'randr', 'vidmode'
; type 'redshift -m list' to see all possible values.
; 'randr' is the preferred method, 'vidmode' is an older API.
; but works in some cases when 'randr' does not.
; The adjustment method settings are in a different section.
;adjustment-method=randr

; Configuration of the location-provider:
; type 'redshift -l PROVIDER:help' to see the settings.
; ex: 'redshift -l manual:help'
; Keep in mind that longitudes west of Greenwich (e.g. the Americas)
; are negative numbers.
[manual]
lat=48.1
lon=11.6

; Configuration of the adjustment-method
; type 'redshift -m METHOD:help' to see the settings.
; ex: 'redshift -m randr:help'
; In this example, randr is configured to adjust screen 1.
; Note that the numbering starts from 0, so this is actually the
; second screen. If this option is not specified, Redshift will try
; to adjust _all_ screens.
; [randr]
; screen=1

I have everything commented out except for:

[redshift]
temp-day=3400
temp-night=3400
transition=1
location-provider=manual
[manual]
lat=48.1
lon=11.6

I have both temp-day and temp-night set to 3400. You can adjust these accordingly.

transition=1 is probably not necessary for me because I have day and night set to the same value but this may be of interest to you.

location-provider=manual is kind of important as the automatic methods usually fail and redshift will fail to start.

If you have night and day set to different temperatures, you should determine your latitude (lat) and longitude (lon) and set these accordingly.
Of course: if day and night are set to the same temperature, you can leave these at the default coordinates (41.8 and 11.6).

+ 3

Archisman Panigrahi

2/12/24, 2:14 PM

Somehow the automatic location works for me. But otherwise, thanks for the answer

Terrance

2/13/24, 2:32 PM

@ArchismanPanigrahi I believe the automatic works when you have the `geoclue-2.0` package installed. If you also install the `geoclue-2-demo` you can see if the `geoclue-2.0` is working properly when you get output from running `/usr/libexec/geoclue-2.0/demos/where-am-i`

mchid

2/17/24, 3:49 AM

@ArchismanPanigrahi Even with geoclue working, I've had problems with redshift where there is an error on startup and then the fix is to reinstall geoclue-2.0 which can be kind of annoying. It seems to happen randomly but I haven't looked into why the problem occurs. Of course if you encounter this problem in the future, you can set the coordinates manually to avoid the issue.

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