There is a variable to disable 3d acceleration for a program: diff -u <(LIBGL_ALWAYS_SOFTWARE=t glxinfo) <(glxinfo) [...] -OpenGL vendor string: VMware, Inc. -OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 0x301) +OpenGL vendor string: nouveau +OpenGL renderer string: Gallium 0.4 on NV46 [...]
(Omitted many lines with different extensions or visuals.) So I would trust the vendor and renderer strings more. Not tested them on other machines.
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