Hi,
sudo dpkg-reconfigure xserver-xorg does not work for me too.
Instead open your xorg.conf with gedit (or whatever you like) as:
sudo gedit /etc/X11/xorg.conf
and replace the Section "Monitor" with this one taken from the Gentoo
Wiki
Section "Monitor"
# Block type: 2:0 3:fd
# Block type: 2:0 3:fc
Identifier "Acer AL2216W"
VendorName "ACR"
ModelName "Acer AL2216W"
# Block type: 2:0 3:fd
HorizSync 30-82
VertRefresh 56-76
# Max dot clock (video bandwidth) 210 MHz
# Block type: 2:0 3:fc
# Block type: 2:0 3:ff
# DPMS capabilities: Active off:yes Suspend:no Standby:no
Mode "1680x1050" # vfreq 59.954Hz, hfreq 65.290kHz
DotClock 146.250000
HTimings 1680 1784 1960 2240
VTimings 1050 1053 1059 1089
Flags "+HSync" "-VSync"
EndMode
# Block type: 2:0 3:fd
# Block type: 2:0 3:fc
# Block type: 2:0 3:ff
EndSection
Then replace the Section "Screen" with this one
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Acer AL2216W"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1680x1050"
EndSubSection
having a nvidia card I first launched sudo nvidia-xconfig and then
replaced the two sections as explained above
Hope can help
--
[Hardy] Screen detection problems with xorg, nvidia and an Acer AL2216W
https://bugs.launchpad.net/bugs/205093
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