Resolution of second screen through dock and display port

I have a lenovo legion using fedora 32 pluged to a kensington SD4600P through a USB-c ; which itself is connected to internet and to two identical screens ; a mouse and a keyboard.

One of those screens is connected through a HDMI - HDMI connector, and the other one is connected through a DisplayPort - HDMI connector.

So the USB cable forwards internet + two graphical outputs + mouse + keyboard.

Now, I have a problem because the screen connected with the displayport - HDMI connector is unrecognised ;

Here’s a list (an extract at least) of the avaiable resolutions through xrandr --query

DP-1-1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1024x768      60.00* 
   800x600       60.32    56.25  
   848x480       60.00  
   640x480       59.94  
DP-1-2 connected primary 1920x1080+1024+0 (normal left inverted right x axis y axis) 531mm x 299mm
   1920x1080     60.00*+  50.00    59.94  
   1600x1200     60.00  

As you can see, my second monitor has a bad resolution (1024x768)

Is there a way to fix that ?

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Vnc resolution in gnome

I tried out to manually add the mode I wanted to use, and though gnome recognises the mode ; xrandr fails to configure it :

$ bash -x makeSize
++ gtf 1920 1080 60
++ sed -n -e '/^\s*Modeline\s/s///p'
+ XMODE='"1920x1080_60.00"  172.80  1920 2040 2248 2576  1080 1081 1084 1118  -HSync +Vsync'
+ xrandr --newmode '"1920x1080_60.00"' 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -HSync +Vsync
+ xrandr --addmode DP-1-1 '"1920x1080_60.00"'
+ xrandr --output DP-1-1 --mode '"1920x1080_60.00"'
xrandr: Configure crtc 2 failed

I tried to check what does that mean, with no success

Some explanation on what is crtc :

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Check out this thread, it looks like solved: