Sounds like whatever graphical display you are trying to use is trying to access an OpenGL related function (Or some kind of function that has to do with 3D). The nv driver used for Nvidia cards supports 2D ONLY. I would recommend going to Nvidia's web site and downloading the latest driver and GLX driver that fits your distro configuration. Then see if that fixes your problem. Basically the message is telling you that it's trying to access something that simply does not exist for the display device. Also, I doubt this is an ALSA problem, so always make sure that you check to be sure that you have narrowed the problem down to an ALSA specific problem before posting it on this list. -----Original Message----- From: Frank Pirrone [mailto:fpirrone@localnet.com] Sent: Wednesday, January 29, 2003 8:50 PM To: linux-audio-user(a)music.columbia.edu Subject: [linux-audio-user] problem with snd Using the current Planet CCRMA rpms on a RedHat 8.0 system running ALSA, lowlat kernel, etc. I get the following error when trying to execute the graphical snd linked to openmotif: Xlib: extension "NV-GLX" missing on display ":0.0". Segmentation fault Snd and its tools work fine at the console, but this gui problem has me stumped. My Dell 410 Workstation has the NVIDIA/TNT2 video chipset but I am running the distro's XFree86 driver not the chipmaker's accelerated one. I'm assuming this NV-GLX in the error message is in reference to a video configuration problem. I guess I'm not making this sound like a Linux-audio problem, but afterall, it is snd. Any help would be greatly appreciated. Frank