[Octave-bug-tracker] [bug #32184] fltk backend: crash in dual graphics card notebook

[Petr Mikulik]

URL:
  <http://savannah.gnu.org/bugs/?32184>

                 Summary: fltk backend: crash in dual graphics card notebook
                 Project: GNU Octave
            Submitted by: mikulik
            Submitted on: Wed Jan 19 22:32:02 2011
                Category: Plotting with OpenGL
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Crash
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

There are notebooks with dual graphics card, typically Intel (low energy
consumption) and Nvidia or ATI (high performance). I have compiled Octave on a
notebook with switchable Nvidia card. Octave runs well with Nvidia on, but if
I restart notebook with Intel on and Nvidia off, then Octave crashes after
trying to plot with fltk:


> backend fltk
> plot(1:10)
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...
Neoprávněný přístup do paměti (SIGSEGV)


Trying to get info about OpenGL:

$ glxgears 
Xlib:  extension "GLX" missing on display ":0.0".
glxgears: Error: couldn't get an RGB, Double-buffered visual.

$ glxinfo 
name of display: :0.0
Xlib:  extension "GLX" missing on display ":0.0".
Xlib:  extension "GLX" missing on display ":0.0".
Xlib:  extension "GLX" missing on display ":0.0".
Error: couldn't find RGB GLX visual
...


What to do with Octave+fltk in this case? Does fltk work only on OpenGL
hardware?





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