# Night Light enabled only on one external monitor - Redshift alternative works

**URL:** <https://discourse.ubuntubudgie.org/t/night-light-enabled-only-on-one-external-monitor-redshift-alternative-works/1451>\
**Category:** Budgie Applets\
**Created:** [January 7, 2019, 8:27pm UTC](https://discourse.ubuntubudgie.org/t/night-light-enabled-only-on-one-external-monitor-redshift-alternative-works/1451 "2019-01-07T20:27:36Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![pappl](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.ubuntubudgie.org/pappl/32/903_2.png) [@pappl](https://discourse.ubuntubudgie.org/u/pappl)\
**Post date:** [February 13, 2019, 8:44pm UTC](https://discourse.ubuntubudgie.org/t/night-light-enabled-only-on-one-external-monitor-redshift-alternative-works/1451/4 "2019-02-13T20:44:59Z")

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Night light doesn’t work, tried other tweaks today.

Instead i tried **Redshift** , but it gets a geoclue2 error, even with geolocation enabled in settings → privacy.

**It works with a redshift-config file:**

**Install Redshift:**  
`sudo apt install redshift-gtk`

**Create redshift.conf to avoid geoclue2 error:**  
`sudo gedit ~/.config/redshift.conf`

_( Redshift ver. 1.12+ looks for the configuration file in `~/.config/redshift/redshift.conf` (or `${XDG_CONFIG_HOME}/redshift/redshift.conf` ) if `$XDG_CONFIG_HOME` is set. The old location at `~/.config/redshift.conf` is deprecated but still searched as a fall back.)_

Paste this text into the redshift.conf file and customize your geolocation (google your city for lat & long):

> ; Global settings for redshift  
> [redshift]  
> ; Set the day and night screen temperatures  
> temp-day=6500  
> temp-night=3900
> 
> ; 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=0
> 
> ; Set the screen brightness. Default is 1.0.  
> ;brightness=1.0  
> ; It is also possible to use different settings for day and night  
> ; since version 1.8.  
> ;brightness-day=1.0  
> ;brightness-night=0.6  
> ; 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=48.0**  
> **lon=16.0**
> 
> ; 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

**Log off and log in. Works on all screens!** 🕶  
You may uncomment _brightness-day, brightness-night_ to lower brightness too, but it starts to pulse brightness on my screens, so i left it commented (disabled).  
pappl

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