Have you run vglserver_config as specified in the User’s Guide?

> On Jan 9, 2019, at 8:14 AM, Niklas <[email protected]> wrote:
> 
> I am using vncserver to connect to a CentOS7 machine in the network. In order 
> to make use of 3D graphics accelerations I am using VirtualGL. So any OpenGL 
> program needs to be launched with vglrun to make use of OpenGL.
> 
> This works like a charm but only if I log myself in on DISPLAY 0 and launch 
> at least one OpenGL application beforehand. In other words:
> 
> If I
> 
> reboot the machine,
> directly start a vncserver and
> connect to it with a client,
> no OpenGL application is working and I get the error
> 
> [VGL] ERROR: Could not open display :0.
> As soon as I log myself in on DISPLAY 0 and start an OpenGL application the 
> error does not occur anymore until the machine is rebooted again.
> 
> My question:
> How can I run OpenGL applications with vglrun without first running an OpenGL 
> application on DISPLAY 0 after rebooting the machine?
> 
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