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It appears the person asking this question originally found an answer but this is for anyone that comes with a similar question.
These adapters shown are dangerous, do not use them. They violate the USB specifications by allowing unsafe cable connections. Do not use them, destroy them and dispose of them before you damage expensive hardware. I plug keyboard and mouse into the USB 3.0 behind the monitor. I plug the USB-C cable into USB-C port in the MacBook. It charges the MacBook, it display the MacBook screen as a secondary display (via the USB-C) AND the keyboard and mouse work in the MacBook. It also carry sound, so the monitor speaker will play sound from the MacBook. I believe the USB "hub" is probably running in Alternate Mode which allows display, sound and data through the hub. Please note that legacy USB Type-A ports do not support USB-C specific features like 10Gbps Data Transfers, USB-C Power Delivery (PD), and USB-C Alternate mode for Video output. For these features you must connect directly to a USB Type-C port on your computer. This is a little bit late (this post is Oct 2018) but perhaps it will be useful for others who might be researching this question. How about the peripherals though? Is there any chance it would work if a female USB-C to male USB 3.0 adapter or cable was used between the desktop and the display? If there is no chance, any other solution?Perhaps it's worth mentioning, this display supports charging over USB-C (45 Watt) and I would like to use this feature for charging laptop, not sure wouldn't it 'try charging' the desktop PC over the adapter and damage it. I would like being able to switch the display between the laptop and a desktop PC with the least cable swapping possible whilst peripherals (mouse and keyboard) stay connected to the monitor's USB downstream ports. Now we don't have to fight over how the USB ports in the laptop are used and can focus on more romantic aspects of our marriage... view more My wife has an Apple smart watch that comes with a male USB-C plug for its charge station. She was bugging me to plug it into my laptop to charge all the time (the Smart watch needs a lot of charging but don't get me started on that). My wife is a lovely person with very few faults - but I hated her breaking my concentration to plug her damn watch into my laptop all the time.
The proper way to connect USB devices into a USB-A port is with a cable that has a USB-A connector already on it. If the device has a captive USB-C cable, captive as it cannot be removed without breaking something, then it is not to be plugged into a USB-A port. Using a USB-C female to USB-A male adapter like the one shown is dangerous and will not provide the connections needed for the USB-C device. If the device did not need all the connections that USB-C allows then it would have come with a USB-A connector on the captive cable. If your product develops a fault outside of the manufacturer warranty or PB Tech warranty period, we offer a full repair service and are an authorised repair agent for leading brands such as Samsung, HP, Toshiba, Lenovo and more.But there's nothing in the manual that indicates it will do that, so the only way to find out is to either ask Dell, or try it out.
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