XPS 13 7390, Docking Station?

@jphughan 

Thanks for the reply!

The charging should work too? No difference in voltage or something that could damage the laptop?

@sivanbh  charging will definitely work.  Laptops that support being charged over USB-C ports use the USB Power Delivery standard to achieve that.  That standard defines certain voltages, currently ranging from 5V to 20V, and the process involves the power source and the device being charged performing a negotiation.  Basically, the initial connection always starts with 5V power for safety and for compatibility with devices that don't support USB PD, since "regular USB" has always used 5V (except some proprietary standards like Qualcomm Quick Charge).  Then if both devices involved support USB PD, the power source advertises the voltage and amperage levels that it can provide, and the device being charged is allowed to request those if it wants.  (Note: Technically the USB-C cable can also come into play here, because there are USB-C cables that support up to 3 amps, and USB-C cables that support up to 5 amps.  These are sometimes called 60W and 100W cables, respectively, since 3A and 5A at the 20V max is 60W and 100W, respectively.  Cables that support 5A have an "e-marker" chip embedded into them to indicate this, and the power source won't advertise more than 3A unless it sees that e-marker chip.  So if you use a USB-C cable that only supports 3A, then you'll only get up to 3A, i.e. up to 60W if you're using 20V, even if both the power source and the device would otherwise support higher amperage levels.)

The result of this design is that you'll never have a power source that supports the USB PD standard "force" a device to accept a higher voltage than it can actually use.  Worst case you'll have a power source that can't charge the attached device because the power source doesn't support the power levels that the device being charged requires.  For example, the XPS 15 models will only charge from a source that supports 20V.  But even in that case, the device simply won't charge from that power source.  The device won't damage the power source trying to pull more than it can provide, since the device isn't allowed to request anything that the power source doesn't advertise.

@jphughan 

Works perfectly!

Thanks for the detailed answer and for all your help

Happy to help!

Hello myvrecent xps 2019 2in1 7390 is not compatible with my older wd15 dock.

Is there a firmware update ?

@Jimmy02  when you say “not compatible”, what specifically isn’t working properly? Or do you just mean that the 7390 isn’t listed on the WD15’s Compatibility list? It’s pretty typical for an accessory’s compatibility list not to include systems older than a certain time or newer than a certain time, especially if there’s a newer version of the accessory itself as is the case here, but that doesn’t always mean the accessory won’t work with at least some of the systems that fit that description. It just means Dell may not have tested it. Stated differently, a system not being on that list doesn’t necessarily mean it’s known NOT to be compatible.