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I have three displays and one TV connected to my computer. gdm (gnome display manager) somehow thinks that the main display is the TV. To circumvent the problem for all setups: How do I tell gdm to always mirror the main display to all connected displays. I am really wondering why this is not the default behavior of gdm anyway.

Copying the respective monitors.xml from ~/.config to /var/lib/gdm/.config is not a valid solution, because the generated monitors.xml is not generic. It uses display names, serial numbers and so on. Creating a working generic montors.xml could be a solution.

Anybody an idea?

(Debian Stretch, gdm 3.22.3-3+deb9u2)

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