diff --git a/files/linuxserver-kde.user.dockerfile b/files/linuxserver-kde.user.dockerfile
index 6cedbe4b..625a1d31 100644
--- a/files/linuxserver-kde.user.dockerfile
+++ b/files/linuxserver-kde.user.dockerfile
@@ -178,16 +178,6 @@ RUN set -eux; \
     echo 'LANG=ja_JP.UTF-8' > /etc/default/locale; \
     echo 'LANGUAGE=ja_JP:ja' >> /etc/default/locale; \
     echo 'LC_ALL=ja_JP.UTF-8' >> /etc/default/locale; \
-    printf '%s\n' \
-      'export GTK_IM_MODULE=fcitx' \
-      'export QT_IM_MODULE=fcitx' \
-      'export XMODIFIERS=@im=fcitx' \
-      'export INPUT_METHOD=fcitx' \
-      'export SDL_IM_MODULE=fcitx' \
-      'export GLFW_IM_MODULE=fcitx' \
-      'export FCITX_DEFAULT_INPUT_METHOD=mozc' \
-      > /etc/profile.d/fcitx.sh; \
-    chmod 644 /etc/profile.d/fcitx.sh; \
     printf '%s\n' \
       'XKBMODEL="jp106"' \
       'XKBLAYOUT="jp"' \
@@ -219,16 +209,6 @@ RUN set -eux; \
       > /etc/xdg/autostart/fcitx-autostart.desktop; \
     cp /etc/xdg/autostart/fcitx-autostart.desktop "/home/${USER_NAME}/.config/autostart/fcitx-autostart.desktop"; \
     chown "${USER_UID}:${USER_GID}" "/home/${USER_NAME}/.config/autostart/fcitx-autostart.desktop"; \
-    printf '%s\n' \
-      'export GTK_IM_MODULE=fcitx' \
-      'export QT_IM_MODULE=fcitx' \
-      'export XMODIFIERS=@im=fcitx' \
-      'export INPUT_METHOD=fcitx' \
-      'export SDL_IM_MODULE=fcitx' \
-      'export GLFW_IM_MODULE=fcitx' \
-      'export FCITX_DEFAULT_INPUT_METHOD=mozc' \
-      'fcitx -d >/tmp/fcitx.log 2>&1' \
-      > "/home/${USER_NAME}/.xprofile"; \
     printf '%s\n' \
       '[Layout]' \
       'DisplayNames=' \
@@ -238,9 +218,33 @@ RUN set -eux; \
       'ResetOldOptions=true' \
       'Use=true' \
       > "/home/${USER_NAME}/.config/kxkbrc"; \
-    chown "${USER_UID}:${USER_GID}" "/home/${USER_NAME}/.xprofile" "/home/${USER_NAME}/.config/kxkbrc"; \
+    chown "${USER_UID}:${USER_GID}" "/home/${USER_NAME}/.config/kxkbrc"; \
   fi
 
+# Set fcitx environment variables globally when Japanese locale is selected
+ARG USER_LANGUAGE
+RUN LANG_SEL="$(echo "${USER_LANGUAGE}" | tr '[:upper:]' '[:lower:]')" ; \
+  if [ "${LANG_SEL}" = "ja" ] || [ "${LANG_SEL}" = "ja_jp" ] || [ "${LANG_SEL}" = "ja-jp" ]; then \
+    mkdir -p /etc/profile.d && \
+    printf '%s\n' \
+      'export GTK_IM_MODULE=fcitx' \
+      'export QT_IM_MODULE=fcitx' \
+      'export XMODIFIERS="@im=fcitx"' \
+      'export INPUT_METHOD=fcitx' \
+      'export SDL_IM_MODULE=fcitx' \
+      'export GLFW_IM_MODULE=fcitx' \
+      > /etc/profile.d/99-fcitx-env.sh && \
+    chmod 644 /etc/profile.d/99-fcitx-env.sh; \
+  fi
+
+# Apply fcitx ENV globally when USER_LANGUAGE is ja
+ENV GTK_IM_MODULE=fcitx \
+    QT_IM_MODULE=fcitx \
+    XMODIFIERS="@im=fcitx" \
+    INPUT_METHOD=fcitx \
+    SDL_IM_MODULE=fcitx \
+    GLFW_IM_MODULE=fcitx
+
 # create XDG user dirs and desktop shortcuts (Home/Trash)
 RUN set -eux; \
   for d in Desktop Documents Downloads Music Pictures Videos Templates Public; do \
diff --git a/files/ubuntu-root/defaults/startwm.sh b/files/ubuntu-root/defaults/startwm.sh
index b5c97f44..8ae3185c 100755
--- a/files/ubuntu-root/defaults/startwm.sh
+++ b/files/ubuntu-root/defaults/startwm.sh
@@ -1,5 +1,10 @@
 #!/usr/bin/env bash
 
+# Setup XDG runtime directory for KDE/Plasma
+export XDG_RUNTIME_DIR="${XDG_RUNTIME_DIR:-/tmp/runtime-$USER}"
+mkdir -p "$XDG_RUNTIME_DIR"
+chmod 700 "$XDG_RUNTIME_DIR"
+
 # GPU detection and configuration for WebGL/Vulkan/OpenGL support
 NVIDIA_PRESENT=false
 GPU_AVAILABLE=false
@@ -39,11 +44,40 @@ if [ -n "${DISPLAY_REFRESH}" ]; then
   export VGL_FPS="${DISPLAY_REFRESH}"
 fi
 
-# Start DE with appropriate GPU acceleration
-if [ "${GPU_AVAILABLE}" = "true" ] && which vglrun > /dev/null 2>&1; then
-  echo "Starting desktop with VirtualGL acceleration"
-  exec vglrun -d "${VGL_DISPLAY:-egl}" +wm dbus-launch --exit-with-session /usr/bin/openbox-session > /dev/null 2>&1
+# Set additional session variables for KDE
+export XDG_SESSION_ID="${DISPLAY#*:}"
+export QT_LOGGING_RULES="${QT_LOGGING_RULES:-*.debug=false;qt.qpa.*=false}"
+
+# Start KDE Plasma desktop with appropriate GPU acceleration
+if which startplasma-x11 > /dev/null 2>&1; then
+  echo "Starting KDE Plasma desktop"
+  if [ "${GPU_AVAILABLE}" = "true" ] && which vglrun > /dev/null 2>&1; then
+    echo "Starting with VirtualGL acceleration"
+    /usr/bin/vglrun -d "${VGL_DISPLAY:-egl}" +wm /usr/bin/dbus-launch --exit-with-session /usr/bin/startplasma-x11 > /tmp/startwm.log 2>&1 &
+  else
+    echo "Starting with software rendering"
+    /usr/bin/dbus-launch --exit-with-session /usr/bin/startplasma-x11 > /tmp/startwm.log 2>&1 &
+  fi
+  
+  # Start fcitx if installed
+  if which fcitx > /dev/null 2>&1; then
+    /usr/bin/fcitx &
+  fi
+  
+  # Keep the script running
+  echo "Session running. Desktop environment started in background."
+  wait
+  
+elif which openbox-session > /dev/null 2>&1; then
+  echo "Starting Openbox desktop"
+  if [ "${GPU_AVAILABLE}" = "true" ] && which vglrun > /dev/null 2>&1; then
+    echo "Starting with VirtualGL acceleration"
+    exec vglrun -d "${VGL_DISPLAY:-egl}" +wm dbus-launch --exit-with-session /usr/bin/openbox-session
+  else
+    echo "Starting with software rendering"
+    exec dbus-launch --exit-with-session /usr/bin/openbox-session
+  fi
 else
-  echo "Starting desktop with software rendering"
-  exec dbus-launch --exit-with-session /usr/bin/openbox-session > /dev/null 2>&1
+  echo "ERROR: No desktop environment found"
+  exit 1
 fi
diff --git a/files/ubuntu-root/etc/s6-overlay/s6-rc.d/svc-xorg/run b/files/ubuntu-root/etc/s6-overlay/s6-rc.d/svc-xorg/run
index 72c95466..ac5fa980 100755
--- a/files/ubuntu-root/etc/s6-overlay/s6-rc.d/svc-xorg/run
+++ b/files/ubuntu-root/etc/s6-overlay/s6-rc.d/svc-xorg/run
@@ -21,7 +21,7 @@ if [ "${DISABLE_DRI3}" != "false" ]; then
 fi
 
 # Clamp virtual screen max size based on env
-DEFAULT_RES="15360x8640"
+DEFAULT_RES="7680x4320"
 if [ ! -z ${MAX_RES+x} ]; then
   DEFAULT_RES="${MAX_RES}"
 fi