Quoting Jon B cz4c6zc02@sneakemail.com:

Trying Gem in windows; most of it works fine. The video patches don't work, giving the error:

couldn't determine video-driver name error: GEM: pix_videoNT: Unable to connect to video driver

This is under Win XP, Dell Inspiron 8600, Nvidia GeForce FX Go5200

Windows is generally not my area, but pix_video captures from a video source like a DV camera, webcam or digitizer board, and usually has nothing to do with your GPU (ATI All-in-one might be the exception). Do you have any video source for pix_video to use?

I also get the error:

error: GemGlutObj: compiled without GLUT-support - no rendering of GLUT-objects

I think you can safely ignore that error. Only the teapot used/uses GLUT.

cgc

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William Robinson wrote:

Hi. I've just been going through this problem aswell:

...

pd -rt -lib Gem

and it gives the error:

/usr/lib/pd/extra/Gem.pd_linux: libnvidia-tls.so.1: cannot handle TLS data Gem: can't load library

So it looks like it found the library fine, but it has an issue with the nvidia drivers? Can someone point me in the right direction?

I found a strange solution that worked here: http://imgseek.sourceforge.net/faq.html#faq3. This has been irritating me for a couple of days. I thought I should share this as it was unresolved on this list.

it may be unresolved on this list because it is not a problem of pd but about nvidia's drivers and TLS (thread local storage)

the problem is about your kernel: 2.6.x allows using TLS while 2.4.x does not.

now when you are running a 2.4-kernel you cannot use nvidia's TLS-libraries and thus you have to remove them. i am not sure, but i think it is the other way round too: when using a TLS-enabled kernel (2.6) you have to use the TLS-enabled libraries and thus you have to add them.

debian solves this via dynamic creation/deletion of symlinks into/from /usr/lib/tls they are using a helper-application "tls_test", but i think this is added by the debian-maintainer

probably other distributions (should) do it alike ??

mfg.a.sdr IOhannes

PS: this is from nvidia-glx/README.Debian

A Note about Thread Local Storage (TLS):

Under 2.6.x kernels a new TLS method is used and different libraries are required. NVIDIA provides these libraries and at boot time (via /etc/init.d/nvidia-glx) a test is performed on your system to see if your require these extra libraries. Having the TLS libraries installed (in /usr/lib/tls and libglx.so) running under a 2.4.x kernel will cause problems when running GL applications. Likewise, not having these libraries installed under 2.6.x might prevent X from starting at all.

Simple Explanation: To switch back and forth between the two systems simply run:

   /etc/init.d/nvidia-glx start

   This is run automatically at boot time.

To force a certain setting (e.g. you may have a 2.4 kernel patched for NPTL) place USE_TLS=1 in /etc/defaults/nvidia-glx for using the nvidia tls libraries. USE_TLS=0 for not using tls libraries. This isn't normally necessary for most users.

What Happens: Symlinks are created in /usr/lib/tls from libraries installed in /usr/lib/nvidia. Also the libglx.so.VERSION in /usr/X11R6/lib/modules/extensions/ is symlinked to a tls-enabled one.