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I am using Ubuntu 12.04 32bit OS.
When I write on Iibreoffice or open two or
three tabs in Mozilla Firefox or open more than one programs
or open software download center taking my notebook over heating and shutdown.

In System>Details>Overview>Graphics: Unknown

So, how can I avoid over heating and identify my graphics driver and then use my lovely Ubuntu comfortably?
I've searched more then 25+ questions about overheating, but didn't found an answer to
solve my problem.
Notebook Model:
HP COMPAQ CQ43-400TU, Dual Core.
In this picture my notebook configuration:
Important to know that,

In Windows 7, I have operated my notebook by opening many programs, many tabs in Mozilla,not was any problem.
(Please, forgive me for my poor English!)

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