On 04/09/14 11:11 AM, Ladislaus Dombrowski wrote:
> I am running TurboVNC and VirtualGL (v2.3.3) on two linux machines
> running Ubuntu 10.4.  I start up a TurboVNC server on the remote
> machine.  I connect to that server with a TurboVNC viewer.  When I run
> 'vglrun glxgears'  i get:
>
> x$ vglrun glxgears
> Running synchronized to the vertical refresh.  The framerate should be
> approximately the same as the monitor refresh rate.
> [VGL] ERROR: OpenGL error 0x0502
> [VGL] ERROR: in readpixels---
> [VGL]    439: Could not read pixels
>
>
> if I login to the remote machine and then connect with that display on
> the client machine with 'vglrun -d  :x.o glxgears' everything runs
> fine.  As soon as I logout of the remote machine, things don't work
> again.  I've been looking for a couple of weeks but can't find where
> xserver stuff is connected to the Turboviewer DISPLAY.  Any ideas?

The X server on the remote machine must always be running for VirtualGL 
to function, but normally logging out just returns you to the login 
manager and X should still be running.

Are you using an NVIDIA binary driver? When you log out you don't switch 
virtual consoles by any chance?

http://stackoverflow.com/a/22546103/176800

-Nathan

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