QT ver. 5 vs 6 - vendors/renderers are different

[gade@gmx.us]

Hi,

I'd like to upgrade the Qt5 to Qt6 on my trixie debian. Unfortunately 
the version 6 is failing to create drawable (see bellow) and crashes.

ERROR:gl_surface_glx_qt.cpp(157)] glXCreatePbuffer failed.
ERROR:gpu_info_collector.cc(80)] gl::GLContext::CreateOffscreenGLSurface 
failed.
ERROR:gpu_info_collector.cc(342)] Could not create surface for info 
collection.

The difference between versions:
Qt5:
Vendor: NVIDIA Corporation
Renderer: GeForce GT 240M/PCIe/SSE2
Version: 3.3.0 NVIDIA 340.108

Qt6:
Vendor: Mesa
Renderer: llvmpipe (LLVM 15.0.7, 128 bits)
Version: 4.5 (Compatibility Profile) Mesa 23.1.6-1

Is there any configuration (at least env. variable) or this is hardcoded 
in the built configuration?? Thanks

--
René

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