Update!!

Ok so I figured that I can only get the screens mirrored with the adapter which didn't solve my problem. So instead I got VGA to USB C cable so each screen connected to it's own port but for some reason the USB C port is not detected. I have tested the cable on my Mac and it works fine, just not on Ubuntu. So clearly this is driver issue. Does anyone have experience with this on Asus UX433FA laptops? Here is my lsusb output:

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

Bus 001 Device 003: ID 13d3:56cb IMC Networks 

Bus 001 Device 002: ID 046d:c534 Logitech, Inc. Unifying Receiver

Bus 001 Device 004: ID 8087:0aaa Intel Corp. 

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

I am running Ubuntu 18.04.4 on my Asus UX433FA-A5155T. I just bought myself a 2nd monitor and trying to set it up, not as easy as I thought. Here is my set up.

I have one HDMI port connected with HDMI splitter to the 2 monitors. If I plugin the splitter the 2 monitors displays for brief moment in mirrored mode and then it just returns back to my laptop display and both external monitors just black screen. I suspect this can be something to do with the refresh rate but can't be certain.

I played around with xrandr to get the monitors to display which I got one stage in mirrored mode but obviously this is not want I want to achieve, I would like them to flow into each other, each monitor on its own.

I have gathered some information to display what I have, hope this works. If someone can just please let me know if they got their 3 monitors working with Ubuntu 18.04.

Graphics Card:

description: VGA compatible controller
product: Intel Corporation
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 00
width: 64 bits
clock: 33MHz

Xrandr results:

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 309mm x 174mm
1920x1080 60.05 + 60.01 59.97* 59.96 59.93

1680x1050 59.95 59.88

1600x1024 60.17

1400x1050 59.98

1600x900 59.99 59.94 59.95 59.82

1280x1024 60.02

1440x900 59.89

1400x900 59.96 59.88

1280x960 60.00

1440x810 60.00 59.97

1368x768 59.88 59.85

1360x768 59.80 59.96

1280x800 59.99 59.97 59.81 59.91

1152x864 60.00

1280x720 60.00 59.99 59.86 59.74

1024x768 60.04 60.00

960x720 60.00

928x696 60.05

896x672 60.01

1024x576 59.95 59.96 59.90 59.82

960x600 59.93 60.00

960x540 59.96 59.99 59.63 59.82

800x600 60.00 60.32 56.25

840x525 60.01 59.88

864x486 59.92 59.57

800x512 60.17

700x525 59.98

800x450 59.95 59.82

640x512 60.02

720x450 59.89

700x450 59.96 59.88

640x480 60.00 59.94

720x405 59.51 58.99

684x384 59.88 59.85

680x384 59.80 59.96

640x400 59.88 59.98

576x432 60.06

640x360 59.86 59.83 59.84 59.32

512x384 60.00

512x288 60.00 59.92

480x270 59.63 59.82

400x300 60.32 56.34

432x243 59.92 59.57

320x240 60.05

360x202 59.51 59.13

320x180 59.84 59.32

HDMI-1 disconnected (normal left inverted right x axis y axis)