DisplayLink VAIO VPCSE Dell D6000

[harsha]

having issues with dell dock-d6000 when using with sony vaio vpcse17gg, whats always been complicated with my laptop was dual graphics switch between intel and ATI 6630M

when I connect the dock and external monitor to dock

1. Case 1

   ati graphics enabled, display link graphics enabled

   Dxdiag display : ATI driver

   Laptop display : works with correct resolution

   Monitor extended display : is black with my white mouse cursor, i cannot move the windows diaglog window but i can move around with mouse

2. Case 2

   ati graphics disabled, display link graphics enabled

   dxdiag display : Display link driver

   Laptop display : looses resolution

   Extended display connected to dock : works correctly resolution is correct

My monitor is dell : Dell 24 QHD with resolution : 2560 x 1440 and Windows 10 Professionnel N (build 21H1)

I wish to use the monitor with ati display enabled :-) case 1, I dont think its a dock issue as it works with my work dell laptop, I do understand my vaio is old and i am happy to have a usb-3.0 i kind of sense its windows issue can anyone suggest a solution ?
is the issue is due to multiple monitors running on multiple display cards ?