Redshift
Redshift is an open-source software application designed to adjust color temperature of screens based on the time of day.
It does this by gradually shifting the color temperature of the display to reduce the amount of blue light towards the night, and increasing the amount of blue light in the morning.
Users may choose to have screen temperature automatically match their lighting based my geographic location, or based on manually set time-frames. Users may also customize day and night color temperatures, adjust the speed of transitions, and more.
Redshift is best used on X11 systems as it is unmaintained and does not support Wayland.
For Wayland support you may consider Gammastep, a modern fork of Redshift. Alternatively there is also wlsunset, which is a lightweight modern alternative.
Installation
Using Global Configuration
environment.systemPackages = [
pkgs.redshift
];
Using Home Configuration
home.packages = [
pkgs.redshift
];
Configuration
Using Global Configuration:
Options may be found under services.redshift. For more options for configuring Geoclue, check the Geoclue page.
services.redshift = {
enable = true;
temperature = {
day = 5500;
night = 3700;
};
};
services.geoclue2.enable = true;
location.provider = "geoclue2";
Advanced (Home Manager)
services.redshift = {
enable = true;
# Display temperature settings
temperature = {
day = 5700;
night = 3500;
};
# Location settings (replace with your coordinates)
latitude = "27.9880614";
longitude = "86.92521";
# Schedule settings
dawnTime = "6:00-7:45";
duskTime = "18:35-20:15";
# General settings
brightness = {
day = "1";
night = "0.8";
};
extraOptions = [
"-v"
"-m randr"
];
tray = false;
};
# Setting the location works either by using a provider
services.geoclue2.enable = true;
location.provider = "geoclue2";
# Or like this, which can also be set in services.redshift
location.latitude = "27.9880614";
location.longitude = "86.92521";
Tips and Tricks
Location of Options
The Home Manager options are defined in the Home Manager Options Manual.
The global options can be found under services.redshift.
Troubleshooting
Provider is unable to determine location
It may happen that Redshift gets stuck at "Waiting for initial location to become available..." when using the geoclue2 location provider. This may happen when Geoclue is unable to determine your location due to missing information. In that case, you may resort to setting the location manually or using an alternate location service such as beaconDB, which can take advantage of WiFi scanning.
An example of using beaconDB as an alternative:
location.provider = "geoclue2";
services.geoclue2 = {
enable = true;
geoProviderUrl = "https://api.beacondb.net/v1/geolocate";
};