HW specs:
Surface Pro 9
Surface Dock 2
DELL 3007 WFPHC (30") monitor
BlueRigger USB-C (Thunderbolt) to DVI-D (10 feet) cable
I know that my monitor is capable of running 2560 x 1600 resolution, as I have used it at that resolution with past computers.
With the above listed hardware, I was able to successfully get it to work at 1280 x 800 resolution, but when I try to go above that (it shows the options for 1920 x 1080 and 2560 x 1600) it displays a garbled/scrambled image on the screen.
I also tried plugging the BlueRigger cable directly into the USB-C port on my Surface itself and it only shows the 1280 x 800 and 1920 x 1080 options, though only the 1280 x 800 option works.
According to the Surface app on my Surface, it says that my Surface and Surface Dock 2 are both fully up to date in terms of firmware and updates.
I’m trying to diagnose whether this is a faulty cable or a product limitation either of the cable itself, the Surface, or the Surface Dock 2. I’m thinking for now that the monitor is not the issue as I was successfully running 2560 x 1600 resolution with my previous machine as recently as last week.