Xorg Configuration for Unregistered Resolution

[kraxadmin]

I have a monitor with native resolution of 1600*900_60.00, and the intel on
board Gen3 Xeon video chipset (i915).
when i do $> xrandr the 1600x900 resolution is not in the list. I tried to
write an xorg configuration for monitor and I placed it on
/etc/X11/xorg.conf.d/10-monitor. but i must mess some value in there up;
that it ha no effect and doesn't change the resolution.
I am sure the /etc/X11/xorg.conf.d/10-monitor is being read at $>
startx because
if i put anything wrong like ()*! at that file *X* won't start and produce
an error.
The cvt 1600 900 returns:

1600x900 59.95 Hz (CVT 1.44M9) hsync: 55.99 kHz; pclk: 118.25 MHz
Modeline "1600x900_60.00"  118.25  1600 1696 1856 2112  900 903 908
934 -hsync +vsync

also the xrandr produce:

xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192
VGA1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1024x768       60.0*
   800x600        60.3     56.2
   848x480        60.0
   640x480        59.9
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
HDMI3 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)
  1600x900_60.00�� (0xa5)  118.2MHz
        h: width  1600 start 1696 end 1856 total 2112 skew    0 clock   56.0KHz
        v: height  900 start  903 end  908 total  934

And this is my 10-monitor.config file:

Section "Device"
Identifier  "Intel i915"
  Option   "VGA1" #"VGA screen"
  Driver      "intel"
EndSection
Section "Monitor"
  Identifier  "Primary Monitor"
  Modeline    "1600x900_60.00" 118.25 1600 1696 1856 2112  900 903 908
934 -Hsync +Vsync
  Option      "PreferredMode" "1600x900"
EndSection
Section "Screen"
     Identifier    "Screen0"
     Device        "VGA1"
     DefaultDepth  24
     SubSection "Display"
     Depth        24
     Modes   "1600x900_60.00"
EndSubSection
EndSection
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