Good day
My Surface 8 pro does not recognise the USB ports of the monitor. I can charge devices directly from the monitor ports, but when I connect a camera, my Surface does not recognise it. Ethernet has been working since I disabled the power saving mode. Has anyone had a similar problem, or do I have to use the Surface Dock 2 after all? Ah yes Surface is connected via USB C loads and audio connects fine.

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Accepted Answer

This probably has to do with how the USB-C port works. There are 4 high speed lanes available. Both DP and USB 3.0 are transmitted via these 4 high speed lanes. Since the monitor has a very high resolution, all 4 lanes are required for the DP video signal; a USB 3.0 connection is therefore no longer possible. Only a USB 2.0 connection is possible via the other 4 lanes in the USB-C connection, which are specially reserved for USB 2.0. The LAN connection then also runs via USB 2.0. The note can be found in the manual p.34:
https://www.samsung.com/de/business/monitors/s9-s95ua/ls49a950uiuxen/

If the camera explicitly requires USB 3.0, it will not be recognised.
You can test this by switching to high-speed data as described on page 34.

It may be possible to work around the problem by connecting both USB-C ports to the monitor (but this is just conjecture).
Otherwise it is probably necessary to use the Surface Dock and connect the monitor via DP and via USB-C.
The Surface Dock works differently than a USB-C connection and transmits DP and USB 3.0 signals over different lines.

Answer

Thank you for the detailed answer. In this case, could it also be because the refresh rate cannot be set to 120? The monitor menu only shows the function with a grey background. Although the Surface 8 pro and the monitor allow a refresh rate of 120. In that case, the whole system is simply busy and I really need to use the Surface Dock, don't I?

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