(setq
 modus-themes-mode-line '(accented borderless padded)
 modus-themes-region '(bg-only)
 )

(use-package dbus)
(defun mf/set-theme-from-dbus-value (value)
  "Set the appropiate theme according to the color-scheme setting value."
  (message "value is %s" value)
  (if (equal value '1)
      (progn (message "Switch to dark theme")
             (modus-themes-load-vivendi))
    (progn (message "Switch to light theme")
           (modus-themes-load-operandi))))

(defun mf/color-scheme-changed (path var value)
  "DBus handler to detect when the color-scheme has changed."
  (when (and (string-equal path "org.freedesktop.appearance")
             (string-equal var "color-scheme"))
    (mf/set-theme-from-dbus-value (car value))
    ))

;; Register for future changes
(dbus-register-signal
 :session "org.freedesktop.portal.Desktop"
 "/org/freedesktop/portal/desktop" "org.freedesktop.portal.Settings"
 "SettingChanged"
 #'mf/color-scheme-changed)

;; Request the current color-scheme
(dbus-call-method-asynchronously
 :session "org.freedesktop.portal.Desktop"
 "/org/freedesktop/portal/desktop" "org.freedesktop.portal.Settings"
 "Read"
 (lambda (value) (mf/set-theme-from-dbus-value (caar value)))
 "org.freedesktop.appearance"
 "color-scheme"
 )