permanently change KDE DPI

I know this has been asked before but everything I have found on the subject either does not apply or does not work. I am trying to set my DPI under KDE in slackware 12.1 to 75. startx -- -dpi 75 works fine as expected. I have an intel video card. this is my xorg.conf:

Section "ServerLayout"
Identifier     "X.org Configured"
Screen      0  "Screen0" 0 0
InputDevice    "Mouse0" "CorePointer"
InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
RgbPath      "/usr/share/X11/rgb"
ModulePath   "/usr/lib/xorg/modules"
FontPath     "/usr/share/fonts/TTF"
FontPath     "/usr/share/fonts/OTF"
FontPath     "/usr/share/fonts/Type1"
FontPath     "/usr/share/fonts/misc"
FontPath     "/usr/share/fonts/75dpi/:unscaled"
EndSection

Section "Module"
Load  "GLcore"
Load  "dbe"
Load  "dri"
Load  "extmod"
Load  "glx"
Load  "record"
Load  "xtrap"
Load  "freetype"
Load  "type1"
EndSection

Section "InputDevice"
Identifier  "Keyboard0"
Driver      "kbd"
EndSection

Section "InputDevice"
Identifier  "Mouse0"
Driver      "mouse"
Option	    "Protocol" "auto"
Option	    "Device" "/dev/input/mice"
Option	    "ZAxisMapping" "4 5 6 7"
EndSection

Section "Monitor"
Identifier   "Monitor0"
VendorName   "Monitor Vendor"
ModelName    "Monitor Model"
DisplaySize  433 260
EndSection

Section "Device"
Identifier  "Card0"
Driver      "intel"
VendorName  "Intel Corporation"
BoardName   "82852/855GM Integrated Graphics Device"
BusID       "PCI:0:2:0"
Option      "useedid" "false" #just put this here because thats what I did with nvidia
Option      "dpi" "75 x 75" # just put this here because thats what I did with nvidia
EndSection

Section "Screen"
Identifier "Screen0"
Device     "Card0"
Monitor    "Monitor0"
SubSection "Display"
Viewport   0 0
Depth     1
EndSubSection
SubSection "Display"
Viewport   0 0
Depth     4
EndSubSection
SubSection "Display"
Viewport   0 0
Depth     8
EndSubSection
SubSection "Display"
Viewport   0 0
Depth     15
EndSubSection
SubSection "Display"
Viewport   0 0
Depth     16
EndSubSection
SubSection "Display"
Viewport   0 0
Depth     24
EndSubSection
EndSection

/etc/X11/xinit/xinitrc:

#!/bin/sh
# $XConsortium: xinitrc.cpp,v 1.4 91/08/22 11:41:34 rws Exp $

userresources=$HOME/.Xresources
usermodmap=$HOME/.Xmodmap
sysresources=/etc/X11/xinit/.Xresources
sysmodmap=/etc/X11/xinit/.Xmodmap
xdefaults=$HOME/.Xdefaults

# merge in defaults and keymaps

if [ -f $sysresources ]; then
    xrdb -merge $sysresources
fi

if [ -f $sysmodmap ]; then
    xmodmap $sysmodmap
fi

if [ -f $userresources ]; then
    xrdb -merge $userresources
fi

if [ -f $usermodmap ]; then
    xmodmap $usermodmap
fi

if [ -f $HOME/.Xdefaults]; then
        xrdb -merge $xdefaults
fi
# Start the window manager:
startkde

~/.Xdefaults:

Xft.dpi 75.0

kdmrc:

[General]
ConfigVersion=2.3
ConsoleTTYs=tty1,tty2,tty3,tty4,tty5,tty6
PidFile=/var/run/kdm.pid
ReserveServers=:1,:2,:3
ServerVTs=-7
StaticServers=:0

[Shutdown]
BootManager=None
HaltCmd=/sbin/halt
RebootCmd=/sbin/reboot

[X-*-Core]
AllowNullPasswd=false
AllowRootLogin=true
AllowShutdown=Root
AutoReLogin=false
ClientLogFile=.xsession-errors-%s
Reset=/usr/share/config/kdm/Xreset
Session=/usr/share/config/kdm/Xsession
Setup=/usr/share/config/kdm/Xsetup
Startup=/usr/share/config/kdm/Xstartup
ServerArgsLocal=-ac -nolisten tcp -dpi 75

[X-*-Greeter]
AntiAliasing=true
ColorScheme=
EchoMode=OneStar
FaceSource=AdminOnly
FailFont=Nimbus Sans L,10,-1,5,75,0,0,0,0,0
ForgingSeed=1204058411
GUIStyle=B3
GreetFont=Liberation Mono,20,-1,5,50,0,0,0,0,0
GreetString=Welcome to %s at %n
GreeterPos=50,50
HiddenUsers=
Language=en_US
LogoArea=Logo
LogoPixmap=/usr/share/apps/kdm/pics/kdelogo.png
MaxShowUID=65000
MinShowUID=500
Preloader=/usr/bin/preloadkde
SelectedUsers=
ShowUsers=NotHidden
SortUsers=true
StdFont=ClearlyU PUA,13,-1,5,50,0,0,0,0,0
Theme=/usr/share/apps/kdm/themes/circles
UseBackground=true
UserCompletion=false
UserList=false

[X-:*-Core]
AllowNullPasswd=true
AllowShutdown=All
NoPassEnable=true
NoPassUsers=paul
ServerArgsLocal=-nolisten tcp -dpi 75
ServerCmd=/usr/bin/X -br

[X-:*-Greeter]
AllowClose=false
DefaultUser=paul
FocusPasswd=true
LoginMode=DefaultLocal
PreselectUser=Default

[X-:0-Core]
AutoLoginAgain=true
AutoLoginDelay=0
AutoLoginEnable=true
AutoLoginLocked=false
AutoLoginUser=paul
ClientLogFile=.xsession-errors

[Xdmcp]
Enable=false
Willing=/usr/share/config/kdm/Xwilling

I am still stuck at 96 dpi in KDE. I have set firefox to 75 dpi, which is good but I would like everything to be at 75dpi. This is Slackware 12.1 with the KDE that comes with it. Running at 1280 x 768 resolution on a very small screen (not sure of the exact size but looks to be about 9 or 10 inches) Thanks

The key was in the second [X-*-Core] section of kdmrc. I added -dpi 75 to the XserverArgsLocal part of that section and now everything works at the correct DPI.