I tried your workaround but it didn't work. 
when i set the Modes 1440x900 (one of the resolutions from my acer AL2216W) i 
got a heavy distorted image (lots of stripes from the actual image flickering 
on the screen and the upper left part of the image on the laptop lcd) 
from the acer i got the info it was running on 70 Hz (i think thats the reason) 
when i added the Horiz Sync Settings ubuntu was running in "low graphics mode" 
because of an error parsing the xorg.conf so i had to disable it in the 
xorg.conf altogether


This is my Xorg.conf
################
Section "Screen"
        Identifier      "Configured Screen Device"
        Device  "Configured Video Device"

#       SubSection "Display"
#                Modes  "1440x900"
#               HorizSync       30-60
#
#       EndSubSection
EndSection

Section "Extensions"
        Option "Composite" "Enable"
EndSection
##############
Section "Device"
        Identifier    "Intel 945"
        Boardname    "Intel 945"
        Busid        "PCI:0:2:0"
        Driver        "intel"
        Vendorname    "Intel"
        Option  "DRI"   "True"
#Framebuffer off because X11 sometimes locks up at random if not
        Option  "FramebufferCompression"        "False"

        Option "XvMCSurfaces" "6"

-- 
gnome-display-properties quits with segmentation fault
https://bugs.launchpad.net/bugs/324485
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