Re: [Discuss-gnuradio] Running wx gui widgets over xforwarding ssh connection fails

[Marcus D. Leech]

> I receive the following error when connecting to a ubuntu 10.10 
> platform from a debian lenny machine:
>
> address@hidden:~/gnuradio_test$ ./top_block.py
> linux; GNU C++ version 4.4.5; Boost_104200; UHD_003.000.001-release
>
> Xlib:  extension "RANDR" missing on display "localhost:10.0".
> Segmentation fault
>
> Several of the systems I work on run on remote servers and it would be 
> really nice to view the pretty wx fft display remotely.  Has anybody 
> had success with this?
>
> -Phelps
The WX widgets use OpenGL to render some items, and OpenGL seems to want 
certain X server extensions to be available to it.

You could try setting and exporting:

export LIBGL_ALWAYS_SOFTWARE=1

Before starting your remotely-displayed WxPython program.  This is 
supposed to force OpenGL to use software-only rendering, rather
  than trying to find rendering extensions in the X server.  I haven't 
found this to be a reliable way to make it work, but sometimes it
  does.  The problem isn't in Gnu Radio, per se, but the OpenGL library 
that WxPython uses for produce some of the display elements--like
  the graphic sinks.


--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org