Script to switch GNOME to 'the other' monitor (if you have two connected and only one enabled)

switchmonitor

#!/usr/bin/python3

# This tool switches GNOME from one active monitor to the other connected
# monitor.

import dbus

bus = dbus.SessionBus()
display_config = dbus.Interface(
    bus.get_object("org.gnome.Mutter.DisplayConfig", "/org/gnome/Mutter/DisplayConfig"),
    "org.gnome.Mutter.DisplayConfig",
)
serial, crtcs, outputs, modes = display_config.GetCurrentState()

outputs = []
for crtc_id, crtc_modes, _ in crtcs:
    outputs.extend(
        (crtc_id[0], crtc_mode[0], crtc_mode[-1].get("is-current"))
        for crtc_mode in crtc_modes
        if crtc_mode[-1].get("is-preferred")
    )

(connector_id, mode_id), = (
    (connector_id, mode_id) for connector_id, mode_id, current in outputs if not current
)

display_config.ApplyMonitorsConfig(
    serial, 1, [(0, 0, 1.0, 0, True, [(connector_id, mode_id, [])])], []
)