[Octave-bug-tracker] [bug #41747] Octave crashes if you try to plot and your video card is not configured for OpenGL

[Michael Pender]

URL:
  <http://savannah.gnu.org/bugs/?41747>

                 Summary: Octave crashes if you try to plot and your video
card is not configured for OpenGL
                 Project: GNU Octave
            Submitted by: sparx
            Submitted on: Sat 01 Mar 2014 09:05:51 PM GMT
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Crash
                  Status: None
             Assigned to: None
         Originator Name: Michael Pender
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.8.0
        Operating System: GNU/Linux

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Details:

I switched the video adapter I use as my primary recently from an NVIDIA card
to my motherboard video adapter and started getting this error message when I
try to do a simple plot in Octave 3.8.0 under Ubuntu 12.04.3 LTS:

octave:2> plot (tr)
Xlib:  extension "GLX" missing on display ":0.0".
Insufficient GL support
Xlib:  extension "GLX" missing on display ":0.0".
Insufficient GL support
panic: Segmentation fault -- stopping myself...
attempting to save variables to 'octave-workspace'...
save to 'octave-workspace' complete
Segmentation fault (core dumped)

Octave then crashes, losing the results.  I found out that the Intel video
adapter for my motherboard does actually support OpenGL, but the driver
installed for Ubuntu 12.04.3 LTS apparently does not support OpenGL on the
adapter.  I've worked around the problem by switching from OpenGL to gnuplot
before opening any plot windows:
close all
graphics_toolkit gnuplot

However, it would be *much* better if Octave tested for the necessary OpenGL
features and 1) switched to gnuplot as an alternative, or 2) issued an error
message that the necessary OpenGL functionality was not available, instead of
crashing.






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