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[Launchpad Bug Tracker <527149@xxxxxxxxxxxxxxxxxx>]

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Hello.
Yesterday I upgraded from Ubuntu Jaunty to Karmic, and now I'm experiencing the following problem:

After logging in to the system, the screen randomly flickers, and at a
certain point, one of the two things happen:

1. The X screen gets scrambled and freezes. Only the mouse can sometimes
move. Sometimes I can escape this situation by pressing CTRL-ALT-1, and
then returning to the regular display with CTRL-ALT-7, which causes a
small temporary improvement. In other times, even pressing CTRL-ALT-1
cannot get me out of this, and the computer is completely stuck.

2. X crashes, and the GDM login screen appears.

The time it takes for the session to hang varies. It can be anything
between 1 minute to 30 minutes and on rare times even longer. The time
duration does NOT depend on whether I'm using Compiz or not, and whether
sound is being played or not. However, I think that actions which cause
the window manager to work harder (e.g. opening / moving windows) can
make the problem appear sooner.

The second problem is that video playback fails - the video is first
played correctly and after a few seconds sound stops and the playback
gradually slows down until it completely stops. It happens to me in
SMplayer. I'm not sure whether I tried it with other players as well.
This happens in many video formats.

These two problems share the following characteristics:
- They started right after upgrading from Jaunty to Karmic.
- They happen both when I use the NVIDIA driver from the repository (185) or the driver I downloaded from the NVIDIA site (190).
- They don't happen when I use the "nv" video driver, or when I start Ubuntu in "reduced graphics" mode (by uninstalling the NVIDIA driver).

I am using the following software and hardware:
HP Pavilion dv5 with Intel Core 2 Duo
NVIDIA GeForce 9600M GT, propietry driver v190.53 / v185.something
Ubuntu 9.10 Karmic Koala

Other links that discuss what seems to be the same problem:

http://ubuntuforums.org/showthread.php?t=1329698
(Karmic: Screen scramble and freezes)

http://ohioloco.ubuntuforums.org/showthread.php?t=1309015
(Random freezing in 9.10 Karmic)

http://www.econowics.com/linux/326/video-playback-freeze-every-few-seconds-minutes-on-ubuntu/
(Video Playback Freeze Every Few Seconds / Minutes on Ubuntu)

Thanks, Tal

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: crash dv5 flicker freeze geforce hang karmic nvidia pavilion video xorg
-- 
Karmic + NVIDIA cause screen flickering, X crashes and video playback problems
https://bugs.launchpad.net/bugs/527149
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