Standard PTB xorg.conf.d file, for a 10bit VRR Aorus monitor, this file should be in /etc/X11/xorg.conf.d/

90-ptbxorg.conf

# Auto generated xorg.conf - Created by Psychtoolbox XOrgConfCreator.

Section "ServerLayout"
  Identifier    "PTB-Hydra"
  Screen 0      "Screen0" 0 0
  Screen 1      "Screen1" LeftOf "Screen0"
EndSection

Section "Monitor"
  Identifier    "DisplayPort-0"
EndSection

Section "Monitor"
  Identifier    "DisplayPort-3"
EndSection

Section "Device"
  Identifier  "Card0"
  Driver      "amdgpu"
  Option      "VariableRefresh" "on"
  Option      "DRI" "3"
  Option      "ZaphodHeads" "DisplayPort-0"
  Option      "Monitor-DisplayPort-0" "DisplayPort-0"
  Screen 0
EndSection

Section "Device"
  Identifier  "Card1"
  Driver      "amdgpu"
  Option      "VariableRefresh" "on"
  Option      "DRI" "3"
  Option      "ZaphodHeads" "DisplayPort-3"
  Option      "Monitor-DisplayPort-3" "DisplayPort-3"
  Screen 1
EndSection

Section "Screen"
  Identifier    "Screen0"
  Device        "Card0"
  Monitor       "DisplayPort-0"
EndSection

Section "Screen"
  Identifier    "Screen1"
  Device        "Card1"
  Monitor       "DisplayPort-3"
  DefaultDepth  30
EndSection