https://bugs.kde.org/show_bug.cgi?id=432724

            Bug ID: 432724
           Summary: Allow to pre-configure/pre-seed scaling values
           Product: KScreen
           Version: git
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: kded
          Assignee: kscreen-bugs-n...@kde.org
          Reporter: bhus...@gmail.com
  Target Milestone: ---

SUMMARY

Currently scaling for screen is decided by the kscreen on fly, which means, if
you are starting wayland session for first time, briefly, kwin and plasma would
have a "wrong" scaling until kded starts, and for some reason if kscreen kded
is delayed, it will get stuck on wrong scaling randomly. This is very visible
when starting session with the --lockscreen option on mobile session.

Now there's two solution to this, 

1) we pre-seed values for the kscreen configuration or kwin scaling
configuration. This in theory is possible but quite hard given this config
format uses the UUIDs and there's no way of knowing that and pre-setting this
values using /etc/xdg or something like that. So only way right now is to let
kscreen figure out correct scaling value and set it, in some cases this is too
late and provides very in-consistent experience.

2) We evaluate kscreen scaling configuration before starting anything including
lockscreen.

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