Graphics-intensive tasks cause user logout

[makanaken]

Hi, im new here. i been using ubuntu for about 1 year in my notebook Samsung SENS R530. i dont know why, but im having a problem. When im watching a movie, using facebook apps, playing games, etc. My ubuntu just log out by it self and put me in the log in screen. And all my stuff restart like crashed applications (firefox crash report). It seems like it "crashes" all the time im using applications that needs more resources.
How can i fix this? Does somebody else experiencing this?

thx for the help

[papibe]

Hi makanaken. Welcome to the forums

What version of Ubuntu are you using?

Do you update/upgrade your machine often?

Regards.

[makanaken]

thx papibe. im using ubuntu 12. i update it all the time.

[oldos2er]

Changed thread title to more accurately reflect the problem.

[papibe]

It may be this bug: Random log off in Ubuntu 12.04 LTS.

What is your graphic card? If you don't know, please post the result of this command:

lspci -nnk | grep -iA2 vga

Are you using the Nvidia proprietary driver?

Regards.

[makanaken]

00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 09)
Subsystem: Samsung Electronics Co Ltd Device [144d:c06d]
Kernel driver in use: i915

i think the "random log off problem" is the one, im reading it