Acer AL2216WBD 22in Wide Screen

[Husse]

Wide screen seems to be a bit of a problem
You used horizontal and vertical refresh values from the manual?
Then it seems we can exclude one common error.
Tell us which video card you have and post your xorg.conf

[Husse]

xorg.conf is OK and nvidia no problems....
May be that the resolution is to far off from what's expected
If you use only one monitor add

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Option 		"DynamicTwinView" "False"

to section "Device" makes a difference but not for your problem
One way would be to use a modeline
I've got one for you if you want to use 60Hz vertical
Horizontal Resolution: 1680
Vertical Resolution: 1050
Vertical Refresh Rate: 60.00 Hz
Horizontal Refresh Rate: 65.35 KHz
Dot Clock Frequence: 149.00 MHz

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# V-freq: 60.00 Hz  // h-freq: 65.35 KHz
 Modeline "1680x1050" 149.00  1680 1760 1944 2280  1050 1050 1052 1089 

75 is out of range, 70 would be

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# V-freq: 70.00 Hz  // h-freq: 76.72 KHz
 Modeline "1680x1050" 185.97  1680 1776 2000 2424  1050 1050 1053 1096 

This is no first hand solution, but you could try it
You add it at the end of section Monitor

[Guest]

Did you go into the screens and graphics preferences and change the Model to LCD Panel
either the Acer wide screen you have or to the Generic LCD Panel 1680x1050 (wide screen)
Often there is a box to check for wide screen
With my 22" it requires this change in some Debian based distro's also you will need to log out