# Gr-fosphor driver issues

**URL:** <https://www.ruby-forum.com/t/gr-fosphor-driver-issues/242483>\
**Category:** GNU Radio\
**Created:** [June 26, 2015, 4:54pm UTC](https://www.ruby-forum.com/t/gr-fosphor-driver-issues/242483 "2015-06-26T16:54:05Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [June 26, 2015, 4:54pm UTC](https://www.ruby-forum.com/t/gr-fosphor-driver-issues/242483/1 "2015-06-26T16:54:05Z")

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I’m using an AMD radeon HD 7900 in my computer. When i run a flowgraph  
that  
has an instance of fosphor it shuts down immediately and returns the  
following error:

Using Volk machine: avx\_64\_mmx  
[+] Selected device: Tahiti  
libGL error: unable to load driver: swrast\_dri.so  
libGL error: failed to load driver: swrast  
python2: indirect\_init.c:956: \_\_glXNewIndirectAPI: Assertion `o \> 0’  
failed.

I’ve installed the 14.12 drivers from AMD’s site (on osmo’s site it only  
names drivers up to 14.12, even though the current version is 15.12),  
there  
are 3 choices (proprietary, minimal and developer OGL/OCL), which one  
should I use?

I’ve followed the instructions on

> **[Fosphor - SDR (Software Defined Radio) - Open Source Mobile Communications](https://osmocom.org/projects/sdr/wiki/fosphor)**
>
> Redmine

I have two laptops successfully running fosphor, but they have nvidia  
and  
intel video cards, i’ve never worked with AMD before.

any help would be much appreciated

-b

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<div class="post-metadata">

**Author:** ![ben\_Gee](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/85f322/32.png) [@ben\_Gee](https://www.ruby-forum.com/u/ben_Gee)\
**Post date:** [July 3, 2015, 11:50am UTC](https://www.ruby-forum.com/t/gr-fosphor-driver-issues/242483/2 "2015-07-03T11:50:11Z")

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Hi,

> Using Volk machine: avx\_64\_mmx  
> [+] Selected device: Tahiti

^^ That suggest that the OpenCL part is working

> libGL error: unable to load driver: swrast\_dri.so  
> libGL error: failed to load driver: swrast  
> python2: indirect\_init.c:956: \_\_glXNewIndirectAPI: Assertion `o \> 0’ failed.

^^ Looks like the GL part isn’t. Are you sure you configured your X  
server to use the drivers you installed and not some other one ?

Can you check with glxinfo what it says ?

I never worked with AMD myself so sorry I don’t really know how to  
properly install or use them …

Cheers,

Sylvain