[ltp] 15" DisplaySize (DPI value)

[noc ops]

Based on the below formula my DPI value doesn't appear to be making
sense. Not sure I'm missing something.

I would appreciate if someone could validate this value.


I have a laptop (15") w/ 1024x768 (max) resolution. My xdpyinfo output
displays 85x85 dpi?

formula:
diagonal mm = diagonal inches * 25.4
horizontal mm = 4* diagonal mm / 5
vertical mm = 3 * diagonal mm /5

381mm = 15 * 25.4
305mm = 4* 381mm /5
229mm = 3* 381mm /5

DisplaySize = 305  229


Here's a cut&paste of my xorg.conf
=================================

Section "Files"
        FontPath        "/usr/share/X11/fonts/misc"
        FontPath        "/usr/share/X11/fonts/cyrillic"
        FontPath        "/usr/share/X11/fonts/100dpi/:unscaled"
        FontPath        "/usr/share/X11/fonts/75dpi/:unscaled"
        FontPath        "/usr/share/X11/fonts/Type1"
        FontPath        "/usr/share/X11/fonts/CID"
        FontPath        "/usr/share/X11/fonts/100dpi"
        FontPath        "/usr/share/X11/fonts/75dpi"
        # paths to defoma fonts
        FontPath        "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
        FontPath        "/var/lib/defoma/x-ttcidfont-conf.d/dirs/CID"
EndSection

Section "Module"
        Load    "GLcore"
        Load    "i2c"
        Load    "bitmap"
        Load    "ddc"
        Load    "dri"
        Load    "extmod"
        Load    "freetype"
        Load    "glx"
        Load    "int10"
        Load    "type1"
        Load    "vbe"
EndSection

{snip}
......

Section "Device"
        Identifier      "ATI Technologies, Inc. Radeon 330M/340M/350M
(RS200 IGP)"
        Driver          "ati"
        BusID           "PCI:1:5:0"
EndSection

Section "Monitor"
        Identifier      "Generic Monitor"
        Option          "DPMS"
        DisplaySize     305     229
EndSection

Section "Screen"
        Identifier      "Default Screen"
        Device          "ATI Technologies, Inc. Radeon 330M/340M/350M
(RS200 IGP)"
        Monitor         "Generic Monitor"
        DefaultDepth    24
        SubSection "Display"
                Depth           1
                Modes           "1024x768"
        EndSubSection
        SubSection "Display"
                Depth           4
                Modes           "1024x768"
        EndSubSection
        SubSection "Display"
                Depth           8
                Modes           "1024x768"
        EndSubSection
        SubSection "Display"
                Depth           15
                Modes           "1024x768"
        EndSubSection
        SubSection "Display"
                Depth           16
                Modes           "1024x768"
        EndSubSection
        SubSection "Display"
                Depth           24
                Modes           "1024x768"
        EndSubSection
EndSection

Section "ServerLayout"
        Identifier      "Default Layout"
        Screen          "Default Screen"
        InputDevice     "Generic Keyboard"
        InputDevice     "Configured Mouse"
        InputDevice     "Synaptics Touchpad"
EndSection

Section "DRI"
        Mode    0666
EndSection


Any insight will be appreciated.



regards,
/virendra