Comment # 2 on bug 1093592 from Dany Marcoux

I have found a fix for this. The file '/etc/geoclue/geoclue.conf' needs to have
the following lines:

    [redshift]
    allowed=true
    system=false
    users=

Source:
https://wiki.archlinux.org/index.php/redshift#Automatic_location_based_on_GeoClue2