Hi Andrew It seems, that Redhat9.0 now includes xfree86.4.3, which, according to Leif Delgas should make the synchronization of the swapping of OpenGL buffers with the vertical retrace signal, possible: http://www.gurulabs.com/RedHatLinux9-review.html I will try it, as soon as I get Rh9.0 best regards Christoph ====================================== The Vision Egg mailing list Archives: //www.freelists.org/archives/visionegg Website: http://www.visionegg.org/mailinglist.html