godot: Vulkan/Godot does not start on Ubuntu 20.04 using X11 (works with Wayland)

Godot version: Godot Engine v4.0.dev.custom_build.fea72f2a7

OS/device including version:

timothy@Orion ~> cat /etc/*release
...
NAME="Ubuntu"
VERSION="20.04.1 LTS (Focal Fossa)"
...
timothy@Orion ~> uname -a
Linux Orion 5.4.0-48-generic #52-Ubuntu SMP Thu Sep 10 10:58:49 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

GPU info

Issue description: Starting Godot from a terminal I get the following error:

timothy@Orion:~/Desktop/Godot 4/godot/bin$ ./godot.linuxbsd.tools.64 
Godot Engine v4.0.dev.custom_build.fea72f2a7 - https://godotengine.org
INTEL-MESA: warning: Haswell Vulkan support is incomplete
X Error of failed request:  BadDrawable (invalid Pixmap or Window parameter)
  Major opcode of failed request:  149 ()
  Minor opcode of failed request:  4
  Resource id in failed request:  0x6e00008
  Serial number of failed request:  105
  Current serial number in output stream:  111

Steps to reproduce:

1. Clone and build the latest master branch

git clone git@github.com:godotengine/godot.git
cd godot
scons -j4 target=linuxbsd

1. Install Ubuntu 20.04 Nvidia drivers sudo apt-get install nvidia-driver-450

timothy@Orion ~> apt show nvidia-driver-450
Package: nvidia-driver-450
Version: 450.66-0ubuntu0.20.04.1
Priority: optional
Section: restricted/libs
Source: nvidia-graphics-drivers-450
Origin: Ubuntu
...
Description: NVIDIA driver metapackage
 This metapackage depends on the NVIDIA binary driver and on all of its libraries,
 to provide hardware acceleration for OpenGL/GLX/EGL/GLES/Vulkan
 applications on either X11 or on Wayland.

Verify using X11 and then try to start Godot.

timothy@Orion ~> echo $XDG_SESSION_TYPE
x11

Solution I was able to get Vulkan/Godot to work by instead installing and using Wayland instead. https://askubuntu.com/a/1258280

1. Install Wayland sudo apt install gnome-session-wayland
2. Open /etc/gdm3/custom.conf and ensure WaylandEnable=false is commented.
3. Open /usr/lib/udev/rules.d/61-gdm.rules and comment all lines.
4. Execute sudo systemctl restart gdm3 (may need to reboot entirely)
5. Click on the cogwheel and select GNOME or Ubuntu on Wayland.
6. Execute echo $XDG_SESSION_TYPE in order to confirm you are running Wayland (output should be wayland).

From what I understand, this is an issue with X11? Although I’m not really an expert.