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[Sevan Elyasian <728745@xxxxxxxxxxxxxxxxxx>]

Upgrading from Ubuntu 11.04 (Natty) to 11.10 (Oneiric), I face the same
problem. I have a GeForce Go 7400 graphic card on my Sony VAIO VGN-
FE890, and I had problems with it on 11.04, too. On Ubuntu Natty, and
after a long series of driver tests, I found that using the experimental
3D driver along forcing the Unity 3D, through adding the
UNITY_FORCE_START=1 to /etc/environment to bypass the blacklist, was the
best I could have done. It was OK, maybe a little bit slow, but it  was
the best config, since I got my screen brightness control working too.

On first restart after upgrading, the log-in screen (lightdm) appears and everything was OK, but after log-in, though I could have moved the mouse pointer, but the screen was frozen. The background picture, my desktop icons and the launcher were loaded and shown on the screen but there was no change of state on clicking or hovering over them. The notification area was partly loaded, and there was something interesting happening on the screen in response to pressing keyboard shortcuts. For example, by pressing Ctrl + Alt + T, though no terminal appears on the screen, but my mouse pointer was changing to re-size icon, while moving on certain areas of the screen, like there is a window there.
Using tty1, I tried all of the available drivers, from "nouveau" to NVIDIA accelerated graphics drivers version current, version current-updates, version 173, version 173-updates, version 96, version 96-updates, and here are the results:

Driver: nouveau > Ubuntu 2D: OK, Ubuntu 3D: slow, Brightness Control: OK
Driver: nvidia-96 + nvidia-common> Ubuntu 2D: OK, Ubuntu 3D: slow, Brightness Control: unavailable
Driver: nvidia-96-updates + nvidia-common > Ubuntu 2D: OK, Ubuntu 3D: slow, Brightness Control: unavailable
Driver: nvidia-173 + nvidia-common > Ubuntu 2D: OK, Ubuntu 3D: OK (maybe a little bit slow), Brightness Control: unavailable
Driver: nvidia-173-updates + nvidia-common > Ubuntu 2D: OK, Ubuntu 3D: OK (maybe a little bit slow), Brightness Control: unavailable
Driver: nvidia-current + nvidia-common > Ubuntu 2D: OK, Ubuntu 3D: screen freezing (as explained above), Brightness Control: unavailable
Driver: nvidia-current-updates + nvidia-common > Ubuntu 2D: OK, Ubuntu 3D: screen freezing (as explained above), Brightness Control: unavailable

Note: All of the above drivers must be installed along with the nvidia-
common, since they won't work either by black screen or freezing one.

So, there is no acceptable configuration, except forgetting about Ubuntu 3D, and using nouveau as driver on Ubuntu 2D, to have the brightness control too.
Any Ideas???

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https://bugs.launchpad.net/bugs/728745

Title:
  [nvidia, 7300, 7400] display freeze when using unity desktop

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