[Solved?] Problem with Mepis 6.5 re NVIDIA's latest legacy driver

Solved now, hopefully. From: https://help.ubuntu.com/community/Bi...2bcdf313b1e75d
it seems that explicitly setting Option "Composite" "Disable" in Section "Extensions" in xorg.conf works! Glxinfo, glxgears -printfps and ppracer seem happy now.

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I had successfully installed NVIDIA's most recent legacy driver for my VANTA card under Mepis 6.0, namely NVIDIA-Linux-x86-1.0-7184-pkg1.run (as the Mepis 6.5 "legacy" package no longer supports the VANTA).

Here's the procedure I used:
- Used mutilties to revert to nv driver in case installation failed (removes nvidia-glx-legacy)
- Was using kernel linux-image-2.6.15-26-386 so ensured kernel headers linux-headers-2.6.15-26-386 installed via Synaptic
- Installed xorg-dev via Synaptic as required by Nvidia installer program
- Exited X by running as root: telinit 3
- Logged in as root
- Changed to directory containing driver file then: sh NVIDIA-Linux-x86-1.0-7184-pkg1.run
- Followed instructions and chose not to download precompiled package from Nvidia but compile instead
- Edited /etc/X11/xorg.conf and changed driver from nv to nvidia
- Rebooted using: init 6
- Checked settings using: nvidia-settings (automatically appeared in my K menu under 'System')

Under Mepis 6.5, tried the same procedure (but using kernel headers linux-headers-2.6.15-27-desktop instead) and the driver seems to get installed okay. However, when I look at:

glxinfo => many errors like:

Xlib: extension "GLX" missing on display ":0.0".
...
Error: couldn't find RGB GLX visual
...
Segmentation fault

NVIDIA X Server Settings =>

The OpenGL extension 'GLX' is not supported by
the X server or there was a problem retrieving
GLX information from the X server.

Also tried dpkg-reconfigure xserver-xorg and apt-get remove --purge nvidia-xxxx to no avail.

Any ideas, please?