rave002--- via tde-users composed on 2025-11-22 17:48 (UTC):
Do you absolutely need TDM? It's quite old display manager and has troubles launching non-X11 sessions. I find that SDDM is decent enough and more maintained than TDM is.
TL;DR: While I love Trinity as it's much faster and less error-prone than Plasma these days, I don't really get why you'd use TDM when better greeters exist.
The are no better greeters for my use than KDM and TDM. SDDM and Wayland are big brother limiting abominations. KDM's default un-themed login window is a purposed gem thankfully provided intact by Trinity Desktop. e.g.: TDM enables explicit specification of who will appear in the login list via one config file line item using users' names, rather than the (multiple) ID range(s?) of numbers necessary and limiting in SDDM.
I still have Plasma on multiple installations. On most, all but 2 I think, I've replaced SDDM with either KDM, TDM or LightDM. e.g. on my sole Neon, which I'll probably abandon before much longer[1], it's TDM that I have enabled, having no use for the limitations of Wayland sessions.
[1] Why: https://bugs.kde.org/show_bug.cgi?id=15329#c127 + X11 deadend. Plasma's grossly incompetent WRT restoring windows to the positions, virtual desktops, and window sizes of last. X11-free, it's dead to me.