ViewSonic VX2835wm - only Analog video ?

Strange,
I normally have the mini connected to a Dell 2702WFP using the supplied mini-DVI to DVI adaptor. The native resolution of the display is 1920x1200. Works fine.
As a replacement for TV I use a ViewSonic VX2835wm. This is a Monitor which basically has similar specs to the Dell (however, only half the price of Dell - but for TV this is ok).
The Viewsonic is connected from the DVI output of a DVDO Iscan HD+ with a DVI to HDMI cable. The DVDO can send either Digital Video or Analog to the Viewsonic. Both work.
Now, when I connect the Mini to the Viewsonic using the same cable, I only have analog Video - The picture is unsharp, fuzzy edges, small color-distortions. Also in the menu of the mini I have:
1920x1200 (pal/ntsc), and 1920x1080 (pal/ntsc).
I do not like analog Video because Playback of a HD movie using analog doesnt look better then SD through the DVDO.
Both monitors support HDCP and the Mini is able to output Digital Video at 1920x1280 as I can see when I connect it to the Dell Screen.
The Viewsonic is able to Display a Digital Signal throug the DVDI-HDMI cable.
Is there any way to overcome this limitation - can I force the Mini somehow to only send Digital Video ?

After doing some research, i now have more information - but instead of making things clear I am confused more.
The signal is indeed digital, but, the Monitor identifies itself to the mac as a "Television Screen" - or the Nvidia driver interprets the output of the EDID as this.
there is an additional option in the monitor control panel, where "overscan" is selected (does not appear when the mini is connected to the DELL Display).
If I unselect this, the 1920x1200 resolution is gone. only 1080 is possible.
I am no expert in Digital Video transport, but overscan is something which should be nonexistant for a DVI/HDMI video signal.
Does that possibly mean, the Mini sends a 1080p signal, and, by instructing (?) the Display to overscan, the display itself tries to scale the data to 1200 lines ? This would explain the artefacts I observed, but doesnt make any sense.
I finally tried Windows on the Mac Mini, and here the image is perfect.
I anyone else has a good explanation for this behaviour I would like to hear it.

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