RX Vega 64 resolution problem

Hi everyone,

I have an annoying problem after upgrading to Ventura from Monterey, the screen resolution 3840x1620 is only in lodpi while in monterey it was in hidpi (see screenshot attached).

Monterey was in OpenCore 0.8.8, Ventura OpenCore 0.9.5 with last Lilu and WhateverGreen kext
AMD Radeon RX Vega 64 8 GB

Does anyone have any idea how I could solve the problem?

Thanks so much for any help