Don said:
It does support dual displays, but it shows a display that's not
there, and that display is described as "No Monitor".
Just wondering how to remove that.
It sounds kinda like a modern ATI GPU with Eyefinity ?
Regular GPUs have two display channels, and shouldn't show
more than two active monitors. Some of the newer ATI GPUs
have six display channels. The I/O crossbar on the GPU, can
connect to a large number of connectors, with some restrictions.
The first two connectors can be conventional types, like DVI or
HDMI. The other four (optional) ones are DisplayPort connectors.
Maybe your third monitor is a DisplayPort channel or something ?
I don't know if DisplayPort has impedance sensing or not. There
isn't a particular reason it couldn't have that, in which case
there is no reason to show a third monitor, unless it is actually
connected.
If a DisplayPort channel was adapted to another display type
(by a chip after the GPU), maybe then a phantom display appears,
because the ATI software doesn't know about it. (Maybe it isn't set
up to detect things on the other side of an adapter ?) That makes
it effectively a Plug and Play, that you can't disable.
You can play with moninfo, but I don't know if that will shine any light
on the issue or not. I can't think of much else that can come close.
This doesn't really say anything about the crossbar, or provide GPU
details.
http://www.entechtaiwan.com/util/moninfo.shtm
This is a GPU identification utility, but it isn't interested in
hardware details like this either.
http://www.techpowerup.com/downloads/SysInfo/GPU-Z/
I don't know of any way to display info about how the GPU
I/O is set up.
Just a wild guess,
Paul
