The monitor you have reports the following modes:
Display Modes
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640x480x24@60
640x480x24@75
720x400x24@70
800x600x24@60
800x600x24@75
1024x768x24@60
1024x768x24@75
1152x864x24@75
1280x1024x24@60
1280x1024x24@75
1920x1080x24@60
So if the adapter doesn't support resolutions up to 1920x1080, 1280x1024 will be the maximum resolution.
I think you have 2 adapters from IOGear. One contains our older DL-160 chip and a newer one contains the DL-165. The DL-160 will not support 1920x1080, but the DL-165 will, which is why you are seeing a difference in the adapter behaviour.
I think IOGear did a silent introduction of the new DL-165, keeping the product number the same, as the new product supported all the features of the old product and now supported 1920x1080. That's why the online description is correct for new adapters, but not correct for the first generation of this product.
So I think everything works as designed and explains why you cannot get the resolution on one of the adapters.
Wim
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