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DescriptionKonstantin Olchanski
2013-04-22 19:31:10 UTC
The 6.4 update replaced tigervnc-1.0.90-0.17.20110314svn4359.el6.x86_64 with tigervnc-1.1.0-5.el6.x86_64. The updated VNC server is missing the GLX extension and all OpenGL programs fail to work. Typical errors are:
$ glxinfo
name of display: :1
Error: couldn't find RGB GLX visual or fbconfig
$ glxgears
Error: couldn't get an RGB, Double-buffered visual
$ glxgears (on a machine with NVIDIA proprietary drivers)
Xlib: extension "GLX" missing on display ":2".
Error: couldn't get an RGB, Double-buffered visual
I confirm that all these programs worked before this update and still work on a 6.3 machines.
The following patch was recently applied to current TigerVNC sources and may be relevant to this problem:
http://tigervnc.svn.sourceforge.net/viewvc/tigervnc/trunk/unix/xserver/hw/vnc/xvnc.cc?r1=5047&r2=5067
Removal of OpenGL and GLX capability from VNC causes a big problem for us. We use VNC to run some scientific applications (i.e. COMSOL) on head-less server machines to do heavy computations in batch mode (>16GB of RAM, >24 hours of running time). In this mode, these applications do not do any heavy graphics, but would not start if OpenGL is not present. For a number of reasons running these applications via SSH-tunneled X11 is not practical.
Please restore the previously existing and supported OpenGL functionality to the current RHEL VNC server.
K.O.