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I have an Ubuntu 14.04 system with the following packages installed:

libegl1-mesa:amd64

libegl1-mesa-drivers:amd64

libgl1-mesa-dri:amd64

libgl1-mesa-dri:i386

libgl1-mesa-glx:amd64

libgl1-mesa-glx:i386

libglapi-mesa:amd64

libglapi-mesa:i386

libgles2-mesa:amd64

libglu1-mesa:amd64

libopenvg1-mesa:amd64

libwayland-egl1-mesa:amd64

mesa-utils

xvfb

I want to start an application under xvfb. I first start xvfb with:

$ Xvfb :1 -screen 0 1024x768x24 +extension GLX +render -noreset >> xsession.log 2>&1 &

and then check the xvfb log file:

Initializing built-in extension Generic Event Extension

Initializing built-in extension SHAPE

Initializing built-in extension MIT-SHM

Initializing built-in extension XInputExtension

Initializing built-in extension XTEST

Initializing built-in extension BIG-REQUESTS

Initializing built-in extension SYNC

Initializing built-in extension XKEYBOARD

Initializing built-in extension XC-MISC

Initializing built-in extension SECURITY

Initializing built-in extension XINERAMA

Initializing built-in extension XFIXES

Initializing built-in extension RENDER

Initializing built-in extension RANDR

Initializing built-in extension COMPOSITE

Initializing built-in extension DAMAGE

Initializing built-in extension MIT-SCREEN-SAVER

Initializing built-in extension DOUBLE-BUFFER

Initializing built-in extension RECORD

Initializing built-in extension DPMS

Initializing built-in extension Present

Initializing built-in extension DRI3

Initializing built-in extension X-Resource

Initializing built-in extension XVideo

Initializing built-in extension XVideo-MotionCompensation

Initializing built-in extension SELinux

Initializing built-in extension GLX

which shows no errors. Also, it seems that GLX has been loaded properly.
Now, if I check the server with

$ glxinfo -display :1

I get

name of display: :1

Xlib:  extension "GLX" missing on display ":1".

...

Error: couldn't find RGB GLX visual or fbconfig

Xlib:  extension "GLX" missing on display ":1".

...

Error: couldn't find RGB GLX visual or fbconfig



Xlib:  extension "GLX" missing on display ":1".

...

In fact, the application that I want to start on this server and that needs GLX won't start.

After checking several documentation pages and forums, I have no clue as to what is going wrong here. Why does the X server log file not show any errors if the GLX extension was not loaded correctly? Is there something I should check?

in my log files i see everything is okay up to Initializing built-in extension GLX
but then it is followed by

The XKEYBOARD keymap compiler (xkbcomp) reports:

> Internal error:   Could not resolve keysym XF86AudioMicMute

Errors from xkbcomp are not fatal to the X server

may be the key issue is with xkbcomp?

In wiki page of Xvfb it says:" Unlike a real display server, Xvfb does not support modern X11 extensions like compositing, Randr or GLX. Xdummy is a newer alternative which supports these extensions as well as providing the same functionality as Xvfb."

Xvfb (X virtual Frame buffer) is a Xsever virtual do not support real hardware acceleration.

You need spawn openGL calls, with virtualGL, fork the real calls via a real 3D Xserver and 2d rendering to Xvfb or another 2D Xserver.

$ Xvfb :1 -screen 0 1024x768x24 +extension GLX +render -noreset >> xsession.log 2>&1 &

$ env DISPLAY=:1 vglrun glxinfo