OpenGL over X11/SSH

Polytropon freebsd at
Thu Sep 22 03:17:52 UTC 2016

On Wed, 21 Sep 2016 17:50:53 +0200, Andrea Venturoli wrote:
> I'm used to connecting via ssh to a couple of "heavy duty" servers on my 
> LAN; I've got X11 forward working and in fact I usually run emacs, 
> xterm, sometimes even FireFox.
> Now I need to try an OpenGL-based program, but I'm not able to get it right.
> > % glxinfo
> > name of display: localhost:11.0
> > libGL error: failed to open drm device: No such file or directory
> > libGL error: failed to load driver: r600
> > libGL error: unable to load driver:
> > libGL error: failed to load driver: swrast
> > X Error of failed request:  GLXBadContext
> >   Major opcode of failed request:  154 (GLX)
> >   Minor opcode of failed request:  6 (X_GLXIsDirect)
> >   Serial number of failed request:  46
> >   Current serial number in output stream:  45
> AFAICT this should work, albeit without hardware acceleration, which is 
> fine to me since this is only going to be a test.

If I understand the messages correctly, the OpenGL output requires
direct rendering (DRM) instead of a software renderer. The DRM/DRI
task is being performed directly on the hardware the program is
running on and maybe cannot be redirected to a remote X system.
The somehow direct access to the hardware maybe cannot be tunneled
over X11/SSH. The messages indicate that the DRM device cannot be
found and the r600 (Radeon?) driver cannot be loaded. This is a
quire early error of libGL.

On the other hand, if you use software rendering, it _should_ work.

Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...

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