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I just compiled the 2.6.3 kernel in Slackware, and installed Nvidia's newest drivers. At first, I couldn't get the OpenGL screensavers in KDE to work. They'd just display a black screen. This section of the Nvidia drivers README helped me realize the "load glx" was still commented out of the XF86Config file:
Q: X starts for me, but OpenGL applications terminate immediately.
A: If X starts, but OpenGL causes problems, you most likely have a
problem with other libraries in the way, or there are stale symlinks.
See Appendix C for details. Sometimes, all it takes is to rerun
You should also check that the correct extensions are present;
'xdpyinfo' should show the "GLX", "NV-GLX" and "NVIDIA-GLX" extensions
present. If these three extensions are not present, then there is
most likely a problem with the glx module getting loaded or it is
unable to implicitly load GLcore. Check your XF86Config file and make
sure that you are loading glx (see "Editing Your XF86Config File"
above). If your XF86Config file is correct, then check the XFree86
log file for warnings/errors pertaining to GLX. Also check that all
of the necessary symlinks are in place (refer to Appendix C).
Now, the "GLX" and "NV-GLX" are displayed, but the "NVIDIA-GLX" extension still isn't displayed. Suggestions?
Also, some of the screen savers are still only displaying a black screen. And they're not labeled as OpenGL ones either. I know one potential problem could be that I compiled the "agpgart" kernel option statically. Would this conflict with the Nvidia drivers?
The only error message I'm getting from kcontrol is "WARNING: KDE detected X Error: BadMatch (invalid parameter attributes ) \x08 Major opcode: *", but even the screensavers that are working fine are giving that error.
Another thing: Some times different drivers are used when executing the screensavers from kcontrol and executing the binary. On my system the executables are in /usr/lib/xscreensaver/. Try if they work.