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I've run Xnest server. It appears Xnest doesn't use my graphic card or at least it doesn't use direct rendering.

Normal Xorg glxinfo

OpenGL vendor string: Tungsten Graphics, Inc
OpenGL renderer string: Mesa DRI Intel(R) Sandybridge Mobile 
OpenGL version string: 3.0 Mesa 8.0.3

Xnest Xorg glxinfo

OpenGL vendor string: VMware, Inc.
OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 0x301)
OpenGL version string: 2.1 Mesa 8.0.3
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up vote 2 down vote accepted

XNest is a "Virtual" X Server, it runs on top of the existing server. Just like with virtual machines, the emulated or "virtual" device is often a generic virtual device. Being generic and virtual they use their own set of drivers, etc. So basically it shows differently because it is a virtual copy of the actual window server.

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That's ok, but why there is also difference between OpenGL versions? – kravemir Jul 10 '12 at 18:57
Different drivers. The VMWare, Inc driver evidently hasn't been updated in a bit. – lornix Jul 10 '12 at 21:53

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