Why does Karmic Freeze??

> Freezes Regularly
Needs clarification.
Due to lack of information adding a recent question about 'freezing'.
https://answers.launchpad.net/ubuntu/+source/yelp/+question/98715

98715 says that mouse continues,
In my case the whole screen freezes and only Karmic,
On the Other Hand under SUN Vbox it does not freeze!

Sun VBox "shows" to guest karmic a virtual graphic card which is not the real one.
So problem could lie in bugged support of this graphic card.
Perhaps Karmic doesn't use the same version of graphical packages than other distributions.
Can you provide the model of your graphic card ?
Karmic freeze after the panel which ask username/login or before ?

From my part my computer doesn't freeze under Karmic...but under Vista!

Thanks I will check this up within 24hrs

Freezes after Login not always at same Point.

Do Ctrl+Alt+F6.
Computer should switch from X11 (graphic mode) to a terminal.
Ctrl+Alt+F7 go back to X11.

If it works, problem lies in management of graphic card.

This seems to work on Linuxmint 8.10

Linuxmint is based on Ubuntu, but with more proprietary drivers.
And we talk of version 9.10 of Ubuntu and 8.10 of Linuxmint.
On linuxmint website, I see version 8 of Linuxmint is based on Karmic (I see no version 8.10).

As it works with Linuxmint 8.10, you have to check with Ubuntu 9.10
If Ubuntu 9.10 fails on Ctrl+Alt+F6, you have to check graphic card driver:
     System->Administration->Device Driver
For example, on my computer under Ubuntu, I replaced free driver by NVidia driver.
What is the model of your graphic card ?

Delance thanks for your detailed answer
a) This is LinuxMint 6 based on Ubuntu 8.10.
b) I have the Karmic CD. and Ubuntu 9.04 only Karmic Freezes.

Soon try Out Delance Suggestions
Many Thanks

It looks like the Graphic Card is from Intel on this Lenovo Desktop.

Do Ctrl+Alt+F6 on Karmic version.
Computer should switch from X11 (graphic mode) to a terminal.
Ctrl+Alt+F7 go back to X11.
If it works, problem lies in management of graphic card.
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You can have a look at "https://wiki.ubuntu.com/X/Troubleshooting/Freeze".
I will read it later.
In system administration -> hardware drivers, can you get information about driver ?
Can you type "sudo lshw -C video" in a terminal ?

 *-display
       description: VGA compatible controller
       product: 82945G/GZ Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 02
       width: 32 bits
       clock: 33MHz
       capabilities: msi pm bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:16 memory:ffa80000-ffafffff ioport:ec00(size=8) memory:d0000000-dfffffff(prefetchable) memory:ffa40000-ffa7ffff

The Above is the Output of lshw command.
Thanks Delance

> ...mouse continues
> In my case the whole screen freezes

Relevance of link are diagnose procedures.

Websearch:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/475429
https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/492271
http://ubuntuforums.org/showthread.php?t=1042692

Thanks Delance Canceling Visual effects seems to have worked,
Hope that Next Version of Ubuntu will do it Automatically.
Sam

Thanks delance, that solved my question.