Uwe Brauer wrote:

> 
> 
> Hi
> 
> I am running Ubuntu 16.04 and the corresponding trinity version.
> 
> But know I have a sort of bizarre problem. I activate the screensaver, I
> select the matrix. I successfully run the test, but when the screensaver
> should start, just a simple empty blank screensaver starts, but not the
> matrix.
> 
> Is there  anybody with a  a similar problem and know how to solve it?
> 
> Thanks
> 
> Uwe Brauer
is GL working on your PC

you can try : /usr/lib/xscreensaver/glmatrix
and man glmatrix will give you some information regarding command line

GL you can test with glxgears and get information with glxinfo

regards