I just switched to Ubuntu, and on Windows I was using f.lux. I was able to set the temperature to a certain time and leave it at that, it wouldn't change at all.

Now I installed Redshift and I can't do that anymore. Could some one help, please?


You can permanently set the color temperature from the command line:
Open (gnome-) terminal, type the command:

redshift -O <temperature>

and press Return

To set it to (e.g.) 3700:

redshift -O 3700

To reset to "neutral":

redshift -x

See for more (command line) options:

man redshift

(Given the fact that Redshift is installed :))

  • 6
    When I type redshift -O for example, it works for about a second, then goes back to normal... What should I do in this situation? edit: nevermind, i got it. thank you so much – Richardplury Dec 27 '14 at 17:12
  • 3
    @Richardplury I have same issue, it goes back after a sec. What did you solve it? – Abhishek Bhatia May 3 '16 at 4:08
  • 1
    same here, always reverts back to defaults – Bachalo Dec 15 '16 at 23:22
  • 3
    You must disable Redshift in the top bar to set the temperature with the terminal. You can do this by clicking the icon and pressing Enabled to uncheck it. @eco_bach – Matt Kleinsmith Mar 1 '18 at 21:01
  • 3
    I had to completely quit the top bar gtk app. I find redshift is a bit finnicky with starting multiple copies, not being able to distinguish between them properly. – 6005 Nov 26 '18 at 3:59

If you use redshift-gtk then @Jacob's method will not work.

You need to create a configuration file in your $HOME/.config directory to change it's settings. Sample configuration file creation described in it's official page, quoted below:

Configuration file

A configuration file can be created, but the documentation is a bit sparse. You’ll have to create it manually and put it in ~/.config/redshift.conf. The following is an example of a configuration file:

; Global settings for redshift
; Set the day and night screen temperatures

; 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.
; Set the screen gamma (for all colors, or each color channel
; individually)
; This can also be set individually for day and night since
; version 1.10.

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

; 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.

; 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.

; 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.

Another sample configuration also found at Ubuntu Documentation.


For those who are looking for answer to this question "When I type redshift -O for example, it works for about a second, then goes back to norma‍l... What should I do in this situation? "

Try - Go to the top of your screen -> The redshift icon -> Click on Enable to disable it -> the go on terminal and type

redshift -O <Temperature>

Worked for me

  • 3
    Note that -o is an "o" (letter) and not the "0" (number. – ximiki Dec 10 '17 at 2:48
  • This worked for me. – WorldGov Feb 7 '18 at 20:16

Redshift GTK (and normal redshift) can be run with options to specify how it is run:

 redshift-gtk -l 52.6:1.6 -t 5700:3500 -g 0.82 -m randr -v

In the above command these commands are used:

  • -l specifies your locations rough coordinates, so it can sync with sunrise/sunset. Usually redshift-gtk tries looking up your location but this won't work unles your computer has GPS so it easier to set manually, using a mapping service to give a approximation of your location (e.g. with with OpenStreetMap)
  • -t sets the color temperature of the screen, for day and for night respectively.
  • -g sets the gamma correction apply
  • -m the method to use. This will likely depend on your desktop compositor.
  • -b can also be used to set screen brightness (also DAY:NIGHT, with values between .1 & 1.

This works largely the same as redshift (and uses pretty much the same options as in man redshift), except it runs with a icon so you can turn it off with switching to terminal. You can run the above command in a terminal, your desktops command launcher (usually Alt+F2), or even create a launcher.

Otherwise it may be better to use a configuration file as in @Mahmudul Hasan Shohag's answer.


Using Debian 10 (KDE), I solved the "1 second issue" going to:

System Settings > Startup and Shutdown > Autostart > double-click on Redshift > Application > Change "Command:" line "redshift-gtk" to "redshift -O 3700" (without quotes)

That changed the temperature permanently.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.