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Plugged in. Restarted headless MacMini. Seconds later ... I could TeamView into a 1920x1080 session. So, it allowed the MacMini running Debian to boot without a monitor attached, which is what I was hoping for. Worked equally well on a PC running Debian.
Ordered the DVI style adapter and couldn’t be happier. Instead of using xserver-xorg-video-dummy on a fresh install of 18.04 ubuntu, I decided to give this a try for setting up VNC to a headless system. My laptop display is 2880 x 1800, so I was able to configure a resolution that works well for my setup. The somewhat cheap graphics card in the headless ubuntu system lists the following when paired with this adapter:
I was only able to get a max resolution of 1080p on a Mac Pro with a Radeon HD 5770 card. I've tried it directly connected to the DVI port as well as connecting through a MDP to DVI adapters. I was able to get higher resolution with a NVidia GT120 in the same machine, but there was a screen re-draw issue using a remote session. It might work well with PCs, but I'd stay away if you're using a Mac.