freeze - brlcad-7.12.4 on Linux over SSH

  • CMarinier

    CMarinier - 2008-07-02


    I have built brlcad-7.12.4 on a Dell 1950 running Debian Etch. When I use it through SSH (with ssh -X) from a Debian Etch PC, it will hang the X window server: the mouse moves but Ctrl-Alt-F1 and Crtl-Atl-Backspace do not work, attempts to kill processes did not help, the only solution is to reboot. I have used it from MS Windows with cygwin X without freezing. This indicates that the problem lies in the interaction between the two computers (perhaps an X problem). Note that other graphics intensive applications (e.g. NETGEN, the ng command) works this way without hanging.

    Has anyone seen this? Anyone have a solution?

    If no one has a solution, I would appreciate suggestions to extract useful information from the computers to characterize the problem.

    Thank you.

    Claude Marinier
    DRDC Ottawa

    • Sean Morrison

      Sean Morrison - 2008-07-02


      I've not seen or heard of this occurring before -- rather bizarre.  It sounds like a buggy display driver, almost undoubtedly related to OpenGL.  That's one of the few things that can readily crash X.  It could be prompted by code in BRL-CAD that is attempting to talk OpenGL for display purposes, but it certainly shouldn't lock things up.  I'd suggest recompiling with --without-opengl and see if that helps.  It doesn't remove any functionality, it just makes MGED talk X instead of XGL with the same drawing commands being performed.



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