Can't enable opengl-compositing with nVidia driver after fail with nouveau

[RussianNeuroMancer]

I not sure it's related to nouveau driver, but I try to provide maximum information.

I try nouveau development brunch from xorg-edgers ppa for OpenGL compositing and games month ago with Kubuntu Maverick Alpha 2. It's work very well (even Portal game by Valve is work on maximum video settings) on my video adater (GT240M), but because some reasons I back to Lucid until Beta release.

Now Beta is out, I download it, install, update from xorg-edgers ppa, try to enable compositing, but no luck this time - OpenGL compositing not work, only XrandR. Okay, I purge xorg-edgers ppa and install nVidia 256.53 driver (I use jockey for installation). But I no get luck this time too - I can not enable OpenGL compositing even with nVidia driver. Driver install fine and work: "NVIDIA X Server Settings" confirm - driver running.

It's KDE bug or nVidia driver bug?

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: kubuntu-desktop 1.199
ProcVersionSignature: Ubuntu 2.6.35-19.28-generic 2.6.35.3
Uname: Linux 2.6.35-19-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Sun Sep 5 21:00:49 2010
ProcEnviron:
 LANGUAGE=ru_RU
 LANG=ru_RU.utf8
 SHELL=/bin/bash
SourcePackage: kubuntu-meta

[Jonathan Thomas (echidnaman)]

It is definitely not a kubuntu-meta bug.

[RussianNeuroMancer (russianneuromancer)]

Jonathan, look's like after fail with nouveau KWin write to kwinrc config option OpenGLIsUnsafe=true.
After that I change driver from nouveau to proprieatry nVidia driver, but this option is still present in config, resulting not allow to enable desktop effects even with nVidia driver.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.