# Running wx gui widgets over xforwarding ssh connection fails

**URL:** <https://www.ruby-forum.com/t/running-wx-gui-widgets-over-xforwarding-ssh-connection-fails/206910>\
**Category:** GNU Radio\
**Created:** [May 13, 2011, 2:35am UTC](https://www.ruby-forum.com/t/running-wx-gui-widgets-over-xforwarding-ssh-connection-fails/206910 "2011-05-13T02:35:20Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dubstep](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/cdc98d/32.png) [@dubstep](https://www.ruby-forum.com/u/dubstep)\
**Post date:** [May 13, 2011, 2:35am UTC](https://www.ruby-forum.com/t/running-wx-gui-widgets-over-xforwarding-ssh-connection-fails/206910/1 "2011-05-13T02:35:20Z")

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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

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<div class="post-metadata">

**Author:** ![Phelps\_W](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/b9bd4f/32.png) [@Phelps\_W](https://www.ruby-forum.com/u/Phelps_W)\
**Post date:** [May 13, 2011, 3:22am UTC](https://www.ruby-forum.com/t/running-wx-gui-widgets-over-xforwarding-ssh-connection-fails/206910/2 "2011-05-13T03:22:50Z")

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> 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

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