I run "xrandr --dpi 168" in .xinitrc, before /usr/bin/startkde. In frameworks <=5.13, this always works. But since I upgraded to 5.14, all KDE applications and Plasma shell no longer respect this setting, and all UI elements are much smaller than before.

If I run "xrandr --dpi 168" again after KDE startup, then any newly launched KDE application would restore to the old behavior -- correctly sized UI. (The only exception is the "Screen Scaling" dialog in systemsettings, where the UI example is still small.) But UI in already running applications like Plasma and kwin decorations would remain small.

Reproducible: Always

Steps to Reproduce:
1. Use a Hi-DPI screen.
2. Run "xrandr --dpi 168" in .xinitrc, before /usr/bin/startkde.
3. Reboot and start KDE.
4. All UI is too small.
5. Run "xrandr --dpi 168" in konsole.
6. Launch Dolphin.
7. UI in Dolphin is larger, where other applications remain small.


Expected Results:  
UI size should be normal when KDE starts.

My .xinitrc:

#!/bin/sh
#
# ~/.xinitrc
#
# Executed by startx (run your window manager from here)

export DESKTOP_SESSION="plasma"

if [ -d /etc/X11/xinit/xinitrc.d ]; then
  for f in /etc/X11/xinit/xinitrc.d/*; do
    [ -x "$f" ] && . "$f"
  done
  unset f
fi

export GTK_IM_MODULE=fcitx
export QT_IM_MODULE=fcitx
export XMODIFIERS="@im=fcitx"
xrandr --dpi 168
xset -b
eval `ssh-agent` 
xbindkeys

exec /usr/bin/startkde