RTX 2070 (with latest driver 445.87 from today)
3x 1080p 60 Hz HDMI Monitor (identical models)
I just bought the CSV-6400 MST Hub and am currently going nuts.
When running any two monitors from the Hub (and the third directly from the GPU) everything works as expected. As soon as I plug the third Monitor into the Hub it gets detected, but only as a generic monitor (not by name like the other 2) that can only show 640×480. Forcing the monitor into another resolution from the nvida control panel results in a kind of “upscaled” image.
The problem also is independant of the port on the Hub.
When having 2 “good” connections adding a third will result in the third one not being detected correctly.
When unplugging 1 “good” connection leaving 1 “good” and 1 “bad”, nothing changes (apart from one “good” screen going black).
When adding a third connection to 1 “good” and 1 “bad” connection, the new connection will work as intended with full resolution.
I also tried another USB cable than the one provided and tried 5 different power supplies (Mainboard, 2 Phone chargers, one Laptop Charger with additional USB Port and a Lenovo USB-PD supply with a Micro-USB Adapter).
I also added a USB Voltmeter in between, reading slightly above 5 Volts (depending on the powersupply used) and around 1.3-1.4 Amps with 3 Displays connected.
Currently no other Displays are connected for debugging reasons, but I want to connect a total of 5-6 devices in the end, though only the 3 monitors mentioned here are relevant to the problem.
The monitors were connected before with the used passive DP-HDMI cables and work flawlessly.