export QT_LOGGING_RULES=qt.webenginecontext=true
simplebrowser_69/simplebrowser --webEngineArgs --use-gl=angle --use-angle=gl-egl 2>errlog
Aborted (core dumped)

Disable ANGLE because GBM is not supported with the current configuration. Fallback to Vulkan rendering in Chromium.
Only --use-gl=angle is supported on this platform.
qt.webenginecontext: 
 Chromium GL Backend: desktop 
 Chromium ANGLE Backend: disabled 
 Chromium Vulkan Backend: native 
 
 QSG RHI Backend: OpenGL 
 QSG RHI Backend Supported: yes 
 GPU Vendor: Nvidia 
 
 Using GLX: yes 
 Using EGL: no 
 Using Shared GL: no 
 Init Parameters:
  *  application-name simplebrowser
  *  browser-subprocess-path /opt/QtO/Qt/6.9.0/gcc_64/libexec/QtWebEngineProcess
  *  disable-blink-features WebOTP
  *  disable-features EyeDropper,AttributionReportingCrossAppWebOverride,BackgroundFetch,InstalledApp,WebOTP,WebPayments,WebUSB,VaapiVideoDecoder
  *  disable-gpu-memory-buffer-video-frames 
  *  disable-setuid-sandbox 
  *  disable-speech-api 
  *  enable-features NetworkServiceInProcess2,TracingServiceInProcess,Vulkan
  *  in-process-gpu 
  *  touch-events auto
  *  use-gl desktop
  *  use-vulkan native

[4607:4625:0214/175147.652098:ERROR:gl_factory.cc(129)] Requested GL implementation (gl=desktop-gl,angle=none) not found in allowed implementations: [(gl=egl-angle,angle=default),(gl=disabled,angle=none)].
GLOzone not found for unknown