Display settings on Hi/LoDPI devices?

[Kristian]

Folks;
wanting to try this again, wondering whether there are any good suggestions
or starting points out there for me to try. Wanting to use KDE on a Dell
Inspiron 2in1 convertible device, I'm without much success stuck wrestling
the internal HiDPI display especially in my setup of working connected to a
dock with a LoDPI display connected. Played around with some configuration
tweaks already, but it always seems to boil down to optimizing display
settings for _one_ particular device, meaning either:

- I set my system to work reasonably well with HiDPI - in this case, user
interface (starting with SDDM for login) ist way too huge to really be
usable.

- I set my system to work reasonably well with LoDPI - in this case, I
hardly can even log in when just using the laptop without an external
display attached.

On the other side, it seems at least GNOME somehow manages to handle this
automatically so there apparently seems some way to detect the current
configuration and use the "right" settings when booting the system. Is
there anything I can do to make something like that work with KDE/SDDM
login?

Thanks in advance and best regards,
Kristian
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