Hi, After further browsing the code, it seems that the problem was in fact that the function swapInterval called by DoSwapInterval was not initialised. The faulty function is __glXMesaScreenProbe in glglxcore.c which initialises all __GLXscreen fields but the swapInterval field. It seems to me that __glXMesaScreenProbe should at minima set swapInterval to NULL.
Indeed, after recompilation with the patch below, the gnome screensaver does not crash any longer. I would guess this will address also the following bug reports: https://bugs.launchpad.net/bugs/115609 http://bugs.debian.org/500887 Regards, Hugo Herbelin *** GL/glx/glxglcore.c.orig 2009-01-07 13:42:17.000000000 +0100 --- GL/glx/glxglcore.c 2009-01-07 13:43:25.000000000 +0100 *************** *** 390,395 **** --- 390,396 ---- screen->base.destroy = __glXMesaScreenDestroy; screen->base.createContext = __glXMesaScreenCreateContext; screen->base.createDrawable = __glXMesaScreenCreateDrawable; + screen->base.swapInterval = NULL; screen->base.pScreen = pScreen; /* -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org