all i have here is glmatrix(the same isn't?)
no, it is not working, some screensavers won't work properly(others from the gl list are not working here either, just black screen or just doesn't run) if you are using compiz or kde desktop effects, i am using compiz atm, are you using it too?
in general i don't use screensavers anymore, i just let the screen off but some users require a security measure, is that your case?