Felix Miata via tde-users wrote:
With two or three displays, sometimes the login panel shows up on one screen only, but on others, it may be two, or may be three. Is there something in tdmrc that I'm missing about GreeterScreen=, or not understanding (near top of file) that can control how many on which greeter appears? Absent a specific GreeterScreen= setting, typically either the lowest resolution screen seems to acquire focus, or first choice goes to connection using the oldest technology (1VGA>2DVI>3HDMI>4DP) if not more than one having it.
What happens if you configure the Monitor & Screen as root (Administrator)?
I recall there are few things to be updated there, but the admin setting might be read first, so it is worth trying. I also found out that "default" is not good in the user context. I would try as root to configure default and as user configure a custom profile. (At least this is my setup ATM)