nv04_stateError message when attempting to run EMC
26 Jan 2015 00:31 #55327
by Treetop
nv04_stateError message when attempting to run EMC was created by Treetop
Hi- I get the following Debug message when attempting to run EMC:-
"python: nv04_state_raster.c:126: get_blend_func: Assertion `0' failed."
Can anyone de-mystify me as to what it might mean?
Thanks
"python: nv04_state_raster.c:126: get_blend_func: Assertion `0' failed."
Can anyone de-mystify me as to what it might mean?
Thanks
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26 Jan 2015 02:21 - 26 Jan 2015 02:22 #55335
by BigJohnT
Replied by BigJohnT on topic nv04_stateError message when attempting to run EMC
It would help if you told us what operating system your running and what version of LinuxCNC or EMC your running as well as when you get the error. Also zip your config files and attach them.
JT
JT
Last edit: 26 Jan 2015 02:22 by BigJohnT.
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26 Jan 2015 03:52 #55339
by Treetop
Replied by Treetop on topic nv04_stateError message when attempting to run EMC
Hi- I am using the iso I downloaded a couple of weeks ago.
Debian Wheezy Version 7 I think, and LinuxCNC 2.6.1. I am running this on an old home brew PC with an AMD Sempron 1.6G processor, so I dont know if this is causing any problems. However the stepper config wizard appears to run successfully.
Attached is the config folder contents.
Jeff
Debian Wheezy Version 7 I think, and LinuxCNC 2.6.1. I am running this on an old home brew PC with an AMD Sempron 1.6G processor, so I dont know if this is causing any problems. However the stepper config wizard appears to run successfully.
Attached is the config folder contents.
Jeff
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26 Jan 2015 05:47 #55347
by andypugh
Googling the file name (nv04_state_raster.c) suggests that the offending code is part of the "nouveau" graphics drivers.
Googling the exact error message brought up a similar thread on the Russian CNC club forum:
translate.google.com/translate?hl=en&sl=...3D145308&prev=search
It seems to be something that can be avoided by using software open-gl.
wiki.linuxcnc.org/cgi-bin/wiki.pl?Troubl...oftware_based_OpenGL
Replied by andypugh on topic nv04_stateError message when attempting to run EMC
Can anyone de-mystify me as to what it might mean?
Googling the file name (nv04_state_raster.c) suggests that the offending code is part of the "nouveau" graphics drivers.
Googling the exact error message brought up a similar thread on the Russian CNC club forum:
translate.google.com/translate?hl=en&sl=...3D145308&prev=search
It seems to be something that can be avoided by using software open-gl.
wiki.linuxcnc.org/cgi-bin/wiki.pl?Troubl...oftware_based_OpenGL
The following user(s) said Thank You: Treetop
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27 Jan 2015 00:54 #55357
by Treetop
Replied by Treetop on topic nv04_stateError message when attempting to run EMC
Andy- many many thanks for pointing me in the right direction.
Disabling nouveau DID clear the problem, albeit with poor quality graphics.
It seems the nvidia driver specific to my GPU is not compatible with Debian Wheezy, so that was not an option.
It looked to me as if the Open GL solution suggested on the wiki used the CPU to do all the rendering rather than the GPU so I thought that might challenge my low spec processor in this real time application.
Anyway, I had a spare graphics card with less ancient technology, and plugging that in has restored the graphics and LinusCNC runs without issue.
Thanks again.
Jeff
Disabling nouveau DID clear the problem, albeit with poor quality graphics.
It seems the nvidia driver specific to my GPU is not compatible with Debian Wheezy, so that was not an option.
It looked to me as if the Open GL solution suggested on the wiki used the CPU to do all the rendering rather than the GPU so I thought that might challenge my low spec processor in this real time application.
Anyway, I had a spare graphics card with less ancient technology, and plugging that in has restored the graphics and LinusCNC runs without issue.
Thanks again.
Jeff
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24 Nov 2015 20:29 #65754
by jepler
Replied by jepler on topic nv04_stateError message when attempting to run EMC
I looked into this. I found a copy of "
nv04_state_raster.c
" online and looked at the function get_blend_func. If an unknown value is encountered in this function, it causes the fatal error you encountered.
AXIS (and Gremlin and other previewing user interfaces) use several blend modes defined in OpenGL. One of them is GL_CONSTANT_ALPHA (you can see it listed in the OpenGL SDK documentation ), but this is not one of the options supported by get_blend_func.
In my opinion, this is a bug in the OpenGL driver that LinuxCNC just happens to hit consistently. You can try filing a bug with your distro or with the upstream library (mesa). I suspect that you can reproduce the problem by taking any old OpenGL demo such as glxgears and adding a call to glBlendFunc(GL_ONE, GL_CONSTANT_ALPHA) and glEnable(GL_BLEND).
I don't have an affected graphics card handy so I can't do this myself.
AXIS (and Gremlin and other previewing user interfaces) use several blend modes defined in OpenGL. One of them is GL_CONSTANT_ALPHA (you can see it listed in the OpenGL SDK documentation ), but this is not one of the options supported by get_blend_func.
In my opinion, this is a bug in the OpenGL driver that LinuxCNC just happens to hit consistently. You can try filing a bug with your distro or with the upstream library (mesa). I suspect that you can reproduce the problem by taking any old OpenGL demo such as glxgears and adding a call to glBlendFunc(GL_ONE, GL_CONSTANT_ALPHA) and glEnable(GL_BLEND).
I don't have an affected graphics card handy so I can't do this myself.
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