I've tried on Openbox, LXDE and KDE, freezes all the time. Randomly in time and battery state, even when system is started and I leave it alone...

I've upgraded NVIDIA drivers, it's still the same... freezes.

On power on notebook works fine to moment od logging in. It can work on battery all the time, after login it crashes....

List of normally runned processes when i'am working:

http://justpaste.it/13wz

Looks like a mix of KDE and GNOME in use there. Unfortunately I doubt that they are involved in particular - considering that Openbox/LXDE is also affected.

I'm afraid this is probably a Hardware, X or Kernel bug. Are you able to get the system to dump a log somehow?

Hello, on the start Thank You for Your help!

After a couple of test and reinstalling Linux Mint now i see that it's not a software problem. I've searched couple of forums and it seems that my laptop is a massive failure in cooling stuff used inside. Currently i'am working on Linux Mint 13 with MATE, problem with hanging system is still annoying me, but now I know what causes it.

The only way to know what is happening is turning on desktop indicators of temperature. Hanging is caused by to high temperature.

Laptop / Notebook: Dell Vostro 3700 (i3)

The only way i found to avoid hanging is controlling temperature, cleaning from time to time cooling exhaust and giving computer to cool down before plugging on or of AC power adapter.

So it's not related with KDE, LXDE, Linux Mint or nothing i thought... Hope it will help

Once more bcooksley Thank You for Your Help!! Cheers!

The way to set up cooling in Dell Vostro 3700 - monitor temperature, install "thinkfan", set temperatures and it should be ok now