Catalina: lock screen weird password field input lag while using RX 460 GPU

As the title says, i'm experiencing a really weird and annoying thing while trying to log in my hack after the PC has been locked up (NOT stopped/suspended).

Basically, after i type the first character of my password the pc lags/freezes for about 1 second before registering my input and update the password field: after the first character everything else i type is registered immediately without lags or stuttering. Also unlocking with my Apple Watch does not work, it hangs forever spinning while eventually stopping and asking me to input manually my password

The thing is that this only happens while i'm using only the dedicated RX 460 GPU (ASUS DUAL-RX460-O2G, iGPU disabled in bios and HDMI connected to the card directly), and NOT when i enable the iGPU in bios and running the cable of of it. Auto unlock also works while using the iGPU

I really have no idea what could me the cause of this, anyone experienced something similar?

Hardware:

  • CPU: i7 4770k
  • GPU: ASUS DUAL-RX460-O2G
  • RAM: 16GB 2-channel
  • Motherboard/Laptop model: MSI Z87-GD65
  • Audio Codec: Apple ALC, ALC1150
  • Ethernet Card: Killer E220x
  • Wifi/BT Card: BCM43602
  • What guide/tool followed: Vanilla setup
  • What part I got an issue with: GPU?
  • What files/config I am using: WhateverGreen + Lilu (+ other kexts, these 2 are the most important for my issue i think)
submitted by /u/mir_ko
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