USB ports in LG27UD88-W computer display not working
I have a 27 inch display LG27UD88-W which has two built-in USB 3.0 ports.
As far as I understand they should work out of the box if I connect my video card with the screen by DisplayPort.
Unfortunately, my computer does not recognize any USB device when plugged in to the screen ports. Mouse and keyboard didn't react neither. Is it possible that my video card does not support it or that a driver is missing? Or is it a defective screen?
My system: Windows 10 Pro, NVidia EVGA 980 Ti with multiple 4K screens connected by DisplayPort.
Solution 1:
Your understanding is incorrect. There is a USB hub in your monitor, no different than an external USB hub. You need to connect a USB cable from your computer to the USB in port on your monitor and that will allow USB devices to work from your monitor.
Solution 2:
The LG27UD88 monitor is indeed a piece of confusing engineering. You have too many options.
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If your video card does not have the Type-C output and you are using DisplayPort, the DP link does not have the USB capability. The Type-A USB3.1 receptacles will not work unless you connect the LG Type-C port via additional C-C cable (to Type-C host) or C-A cable to a regular USB-A host port.
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You can connect the monitor via Type-C port to a Type-C host (using C-C cable), if the host supports Display Port video over Type-C. But then you will need a very special support from host to have USB functionality, because the cable can do either USB, or DP @ 4K resolution,[see correction/clarification below].
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You can use HDMI ports, then #(1) still apply.
The monitor also has tremendous number of options to charge smartphones, but I was lost there.
Enjoy your nice 4K monitor.
TECHNICAL CLARIFICATION: Thanks to comment by Alexander Kosubek, a full-featured C-C connection can support both USB3 (taking two diff-pairs in the cable) and a two-lane DP. However, to support 4K display resolution, the DP must be revision 1.3, while the LG27UD88 can do only v1.2. More, both display and PC host must support a "Type-C alternative mode" as "USB DisplayPort Dock", which implies full support for Power Delivery function, which is needed for proper discovery of Type-C partner. In all cases the USB2 link is supposed to be functional, although it is unclear how it is used in the display. If this makes the use of LG display any less confusing, then this is it.
Solution 3:
From LG's website "The USB port on the product functions as a USB hub. Please connect the USB C-C or USB C-A cable to the PC"
You will have to connect this cable before those ports will work as a hub!
Link to manual (your info on page 17) here