how to fix resolution during KDE start (Kubuntu)

file name: /home/.kde/share/config/startupconfig:

#! /bin/sh
# kcminputrc Mouse cursorTheme 'Oxygen_Black'
kcminputrc_mouse_cursortheme="oxy-white"
# kcminputrc Mouse cursorSize ''
kcminputrc_mouse_cursorsize=""
# ksplashrc KSplash Theme Default
ksplashrc_ksplash_theme="Default"
# ksplashrc KSplash Engine KSplashX
ksplashrc_ksplash_engine="KSplashX"

# kcmrandrrc Display ApplyOnStartup false
kcmrandrrc_display_applyonstartup="true"
# kcmrandrrc [Screen0]
kcmrandrrc_screen0_height="600"
kcmrandrrc_screen0_width="800"

# kcmfonts General forceFontDPI 0
kcmfonts_general_forcefontdpi="96"
# kdeglobals Locale Language '' # trigger requesting languages from KLocale
kdeglobals_locale_language="cs"
# kdeglobals Locale Country ''
kdeglobals_locale_country="us"
klocale_languages=cs:en_US

*********************************************

file name: /home/.kde/share/config/kcmrandrrc:
[Display]
ApplyOnStartup=true

[Screen0]
width=800
height=600