USBC (DP) to VGA adaptor issue

RakeshDesai

I am using a USBC(DP) to VGA adaptor.

I have plugged in a USBc(DP) to VGA adaptor into the unit.  I now have 2 screens (HDMI and VGA) cloned.

Now when I go into Android Settings / DP / Resolution  - I do not get a complete list of resolutions available?
It simply shows 2  options  Auto and 1920x1080p60.00

The unit should show all resolutions that the adaptor can handle.  

I have also tried Leungs dts patch, but still no luck?

I want to use the adaptor with VGA at 1280x1024?

What other files do i need to change.  DTS has patych below

/dts-v1/;
#include "rk3399-firefly-aioc.dtsi"
/ {
        model = "Firefly-RK3399 Board BOX (Android)";
        compatible = "rockchip,rk3399-firefly-aioc", "rockchip,rk3399";
};


&hdmi_dp_sound {
        status = "okay";
};


&route_hdmi {
        status = "okay";
        logo,mode = "center";
};


&hdmi_in_vopb {
        status = "okay";
};

&hdmi_in_vopl {
        status = "disabled";
};

&dp_in_vopb {
        status = "okay";
};

&dp_in_vopl {
        status = "okay";
};