My old Dell Vostro 3350 notebook has both VGA & HDMI outputs. When the LCD lid is closed, both output works.
In Gnome Display Settings, I arranged the logical position to match the physical positions. That is: Left is HDMI while Right is VGA . (Gnome assigned Display Identifiers 2 to VGA and 3 to HDMI)
Now, in GDM, the logical positions are in reverse. That is: VGA is Left while HDMI is right.
How can I override the logical position of displays in GDM?