Im using an nvidia card with the nvidia current drivers. I reinstalled the driver and still my compositing is broken. Compositing is enabled but unusably slow. Disabling it alltogether fixes the problem.

How can I fix this, or at least figure out what is going wrong?

Can you check for the output generated by KWin regarding your systems graphic capabilities to ~/.xsession-errors? It should look something like this:

Code: Select all

OpenGL vendor string:                   Tungsten Graphics, Inc
OpenGL renderer string:                 Mesa DRI Intel(R) Ironlake Mobile
OpenGL version string:                  2.1 Mesa 7.11
OpenGL shading language version string: 1.20
Driver:                                 Intel
GPU class:                              i965
OpenGL version:                         2.1
GLSL version:                           1.20
Mesa version:                           7.11
X server version:                       1.10.4
Linux kernel version:                   3.1
Direct rendering:                       yes
Requires strict binding:                yes
GLSL shaders:                           yes
Texture NPOT support:                   yes

Hi: Here is the the output. btw thanks for the quick reply.

OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: D9M-20/PCI/SSE2
OpenGL version string: 2.1.2 NVIDIA 173.14.30
OpenGL shading language version string: 1.20 NVIDIA via Cg compiler
Driver: NVIDIA
Driver version: 173.14.30
GPU class: Unknown
OpenGL version: 2.1.2
GLSL version: 1.20
X server version: 1.10.4
Linux kernel version: 3.0
Direct rendering: yes
Requires strict binding: no
GLSL shaders: yes
Texture NPOT support: yes

I found the problem. That driver version is incorrect. It is an old driver. For some reason the new drivers were installed on my package manager but the old version was still operating.

The solution was to completely uninstall the drivers and re-install the nvidia-current-updates package.