Do usb display ports (D) support fast charging?

I've a Dell Latitude 7390  (13-inch, i5 laptop). There are two versions. One with a Thunderbolt 3 port and one with a display port.

The model I have has a D next to the port, so it's a display port. But, I've plugged a 65w fast charger in and it fast charges!   From what I read online, which maybe out of date, only the Thunderbolt port supports fast charging?

Can anyone confirm either way?  Or is there a program that will scan the ports and report what they are?

Thanks...

Comments

  • cerebus
    cerebus Posts: 527
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    Have you consulted the instructions which came with the laptop?

    Normally the usb c has a lighting bolt next to it if it supports charging, but dell could have easily made a mistake and fitted the wrong motherboard in your laptop or the wrong case!

    Does your laptop have a separate charging port?

    Normally a usb c with a d next to it only supports 5v charging at most 
  • Jon_01
    Jon_01 Posts: 5,863
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    cerebus said:
    Have you consulted the instructions which came with the laptop?

    Normally the usb c has a lighting bolt next to it if it supports charging, but dell could have easily made a mistake and fitted the wrong motherboard in your laptop or the wrong case!

    Does your laptop have a separate charging port?

    Normally a usb c with a d next to it only supports 5v charging at most 

    The manual says it's a display port and it has the D next to it.

    It does have a charging port and a power brick that it came with.  But it's too big to fit the carry case, so I tried it with a usb charger and found that it quick charged through what it supposed to be the display port!

    As you say, I also suspect that Dell have fitted the wrong motherboard.  It would be nice to know, but I can't find a program that will scan the machine and report on what the ports really are?
  • The specs seem a little muddled, but it does appear that they should support 65w charging over USB-C, it also looks like it should support DP or HDMI 1.4 over USB-C as well. The current Latitude models all seem to support USB PD (65w) so I suspect it was a behind the scenes board upgrade. I am actually surprised that they have not moved the entire range to USB-C already as all the XPS laptops are already only USB-C. Even the Alienware laptops support USB-C charging (140w) although they do have a 330w power brick to support their higher load. 
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