Running wx gui widgets over xforwarding ssh connection fails

GNU Radio
1

I receive the following error when connecting to a ubuntu 10.10 platform
from a debian lenny machine:

pwilliams@ubuntu:~/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

2

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 L.
Principal Investigator
Shirleys Bay Radio Astronomy Consortium