1- The hub has no name, it is a Chinese one. I clarify that when connecting it to the tv, (samsung tv 50) I do not have this problem. I attached a photo of itProbably wrong resolution or missing driver for the hub.
What is the model name of this USB hub? (maybe missing driver)
Did you test if it works with the stock kernel?
Also did you try to change resolution in Android settings?
And one more: in A2N app --> screen --> try to change resolution for Dex.
2- I am going to try at this moment with the stock kernel
3- try changing in many resolutions and the same error is reproduced