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OK, So I tried a couple of options. First, to understand my specs: One USB 2.0, two USB 3.1 Gen 1 (one Always On), one USB 3.1 Type-C Gen 1 (with the function of Power Delivery and DisplayPort), HDMI 1.4b I had another old u2311h which I tried chaining together, and I wouldn't get more than 1024x768. Right now I have U2719DC on one USB Type-C, and another U2719D with HDMI. Is there another way you guys can think of to get another monitor running with at least 1920x1080? Maybe with something like this?

Plugable USB 3.0 to HDMI Video Graphics Adapter with Audio for Multiple Monitors up to 2560x1440 (Supports Windows 10, 8.1, 7)

@erezhazan1  Since you have a U2719DC, then set the USB-C Prioritization setting to High Resolution instead of High Data Speed, and you’ll be able to run dual QHD/1440p from a USB-C connection. This setting causes all four high speed lanes in the USB-C link to be allocated to video, just like your USB-C to DP cable setup. But you’ll be limited to USB 2.0 data speeds. When you set High Data Speed, two of the four high speed lanes in the USB-C link are set up for USB 3.x, which only leaves two for video, meaning your bandwidth is cut in half. That isn’t enough bandwidth for dual QHD/1440p unless your system supports DisplayPort 1.4/HBR3 over USB-C, but most systems today only support DP 1.2/HBR2.

If you don’t see this USB-C Prioritization setting under the MST setting, then you have an early revision. I found out about this from a Dell rep, who said that affected users may be able to exchange their early U2719DC for a replacement that has this option. I wrote a post about that somewhere around here a while ago.

Hey @jphughan, I went through some of your posts and found that this is the related one?

Regarding the screen, I have U2719DC and U2719D, don't know why I wrote a different model! I tried looking for the USB-C Prioritization setting under the MST setting, but couldn't find it, which as you say, it means that I'm an early revision. In that post, you said that you're checking what there is that can be done but you haven't updated what happened in the end (unless it's a different post). What do I need to do in this situation? Did you find a solution? Thanks!

@erezhazan1  That was the thread I was thinking of, but it looks like the follow-up occurred over PM with that other person.  I'll PM you as well.

Hey @jphughan,

I went over your explanation again on this post you did 

https://www.dell.com/community/Laptops-General-Read-Only/Demystifying-USB-C-and-Thunderbolt-i-e-adapter-and-dock/td-p/5153006

And I tried to understand what is the side effects of using USB-C Prioritization setting to use High Resolution instead of High Data Speed, but it just was too complicated for me.. Is that mean that I won't be able to charge the laptop? 

@erezhazan1  Setting High Resolution causes the display to set up the USB-C link to run four lanes of video, which means USB speeds are limited to USB 2.0.  Setting High Data Speed causes the display to set up the USB-C link to run two lanes of video, which allows USB 3.x data.  But when you're using a source system that only supports DisplayPort 1.2/HBR2, two lanes of video isn't enough bandwidth to run a dual QHD daisy chain.  You need four lanes to achieve that with such systems.  The USB-C to DP cable you were using is running four lanes for video because it's not carrying USB data at all.  The only way to run a dual QHD daisy chain and USB 3.x over USB-C is with a source system that supports DisplayPort 1.4/HBR3, but your system doesn't.

But this option does not affect power delivery at all.

So the only downside of High Resolution is that you'll be limited to USB 2.0 data speeds, but that might not be a problem for you based on the type of devices you plan to plug into the display's USB ports (if any at all).  You don't have a way to run dual QHD, USB 3.x, and power all over a single cable.  The only way to do that from a DisplayPort 1.2/HBR2 system is to have a system that also supports Thunderbolt 3 and connect it to a Thunderbolt 3 dock, then connect the displays to that.

@jphughan, in your opinion, what is my other alternatives to connect another screen?

Since I have one on the usb-c, and another one with HDMI, leaving no other outputs to use.

@erezhazan1  So now you want to run three external displays? You were only talking about two earlier.  First of all, be aware that Intel GPUs can only run 3 total simultaneous independent displays, so if your laptop has all outputs run by the Intel GPU (which is pretty common even on systems that also have discrete GPUs), then even if you got 3 external displays connected, you would have to keep your built-in display disabled.  And on Linux, that isn't possible; the built-in display is always on and therefore always counts towards your 3 display max.

But if all you have is a USB-C output and an HDMI output, then you can use a daisy chain or USB-C MST hub to connect multiple displays to that USB-C output and a single display to the HDMI output.  For the daisy chain/MST output, the total bandwidth requirements of all displays must fit within what the USB-C output can provide, so going back to our earlier discussion, having a U2719DC revision that includes USB-C Prioritization can increase your available options.  An MST hub is a workable alternative, but in that case the USB-C port is being used only for video output, without the option of using it for receiving power or exchanging USB data simultaneously.

The only other option would be to use USB dongles that rely on "indirect display" technology such as DisplayLink -- not to be confused with DisplayPort.  There are some benefits to this.  First, instead of carrying video as native video, these dongles rely on a driver to compress video data and convert it to USB data, which means you don't have to worry about GPU bandwidth on outputs like USB-C.  This means you can find dongles that just plug into regular USB-A ports as well, even though USB-A doesn't have native support for video output.  Additionally, the fact that these displays are not driven directly by the GPU means that displays connected through these types of dongles do NOT count toward your GPU's maximum display count.  But if you were wondering, yes there is a catch to all of this.  The way DisplayLink works introduces some drawbacks that can significant in some use cases.  I wrote about them in detail in the post marked as the answer in this thread.  For those reasons, I tend to recommend against DisplayLink unless there's no other way to achieve the display setup someone wants to run -- but even then I make sure they understand the potential issues they may encounter by going that route.