If a monitor has broken or invalid EDID, Weston will not be able to populate the modes on the output and fail to enable the output.
To handle this situation, a fixed modeline can be set for such outputs using the
mode= option in
weston.ini. However, this modeline will always be used even if a monitor with correct EDID is connected. In this case, a different mode might be preferable over the fixed modeline.
fallback-mode= option that accepts a modeline that is only used, if Weston failed to populate the modes from the EDID.