https://bugs.kde.org/show_bug.cgi?id=423600

David Monroe <pecosd...@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
                 CC|                            |pecosd...@yahoo.com
         Resolution|WORKSFORME                  |---

--- Comment #31 from David Monroe <pecosd...@yahoo.com> ---
The info is:

It's very real and still happening.

I got a new laptop recently with a 4K built in screen.  When I'm on just the
laptop I like it scaled to about 175%, the text it just too small on a 16"
screen native-sized at 4K.  When I adjusted this something adjusted the scaling
in sddm - I did not set it manually.

KDE is supposed to remember my monitor layout, this is made obvious in the GUI
by the "just this configuration" check-box. I use three 1080 screens on a dock
when I'm not using the laptop screen, but SDDM comes up huge when I have those
when I log in, and when I get to my desktop it's 175% even with the laptop
closed.  KDE reports the resolution a 4K when I first bring up the adjustments,
until I actually click on a monitor, where it's right.  This is with the lid
closed and the 4K screen inactive.  It's as though it thinks the 4K screen is
in charge even with the lid closed and doesn't realize it's not until I click
on one of the enabled monitors.  Then the scaling won't change until I log out
and back in again, which doesn't work because SDDM immediately switched back to
putting the 4K display in charge.

I manually corrected for myself.

When I set:  ServerArguments=-dpi 96
in /etc/sddm.conf.d/kde_settings.conf

Everything as right.  KDE inherits this from SDDM's kde_settings.conf

I had to do it that way.  When I set the scaling in the GUI and logged out/back
in it made no difference.
I've had other issues with "this configuration" settings and monitors. 
Sometimes, when any setting in the OS changes, like plugging an arbitrary USB
device in, my monitors scramble positions.  My Samsung monitor is on the left,
but if I do anything to my laptop it likes to move it to the middle for no good
reason, this could be because I connected a Bluetooth mouse.

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