Okay, it's night here and it appears that the problem may be with geoclue2. Redshift-gtk can find my lat/long during the day but for some reason it can't now. If I change its location-provider to manual instead of geoclue2 in redshift.conf and enter the correct lat & long it works.
Close redshift-gtk by right-clicking its icon in your notification area of the panel
Create a directory in ~/.config named redshift
Create a file inside that directory named redshift.conf
Paste the following in it:
Code: Select all
; Global settings for redshift
[redshift]
; Set the day and night screen temperatures
temp-day=6500
temp-night=3500
; Disable the smooth fade between temperatures when Redshift starts and stops.
; 0 will cause an immediate change between screen temperatures.
; 1 will gradually apply the new screen temperature over a couple of seconds.
fade=1
; Solar elevation thresholds.
; By default, Redshift will use the current elevation of the sun to determine
; whether it is daytime, night or in transition (dawn/dusk). When the sun is
; above the degrees specified with elevation-high it is considered daytime and
; below elevation-low it is considered night.
;elevation-high=3
;elevation-low=-6
; Custom dawn/dusk intervals.
; Instead of using the solar elevation, the time intervals of dawn and dusk
; can be specified manually. The times must be specified as HH:MM in 24-hour
; format.
;dawn-time=6:00-7:45
;dusk-time=18:35-20:15
; 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=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: '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=10.327970
lon=123.941110
; 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 only screen 0.
; Note that the numbering starts from 0, so this is actually the first screen.
; If this option is not specified, Redshift will try to adjust _all_ screens.
[randr]
;screen=0
Change lines 60 and 61 to your own latitude and longitude as found from
https://www.latlong.net/
Save your changes to the .conf file.
Start redshift from the menu, Accessories -> Redshift and it will work.
You can quit redshift then edit redshift.conf to change the "temp-night" value to a cooler or warmer temperature (more or less blue light) by entering a higher or lower number respectively. BTW the value of 6500 for temp-day is that of a normal computer monitor per
https://iristech.co/what-is-the-best-color-temperature/. Also note that by default redshift slowly fades from one temperature to another over a short period of time. There's a setting in redshift.conf to make it change instantly if you prefer, so you can see changes right away. (The first attached image shows my latitude/longitude as found by geoclue2, the second shows my manual entries as per the website I linked to.)
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