I am new to Linux. I have a Dell Inspiron 15 with a 1st generation Intel Core i3 and Ubuntu 12.10.
My laptop gets heated quickly which doesn't happen on Windows. Also the battery is discharged faster than in Windows. Please help.
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most probably installing the correct VGA driver can reduce overheating. To install correct VGA driver
Most probably, it is due to having several graphic cards enabled simultaneously, usually intel + (Nvidia | ATI). I have this same problem.
You can try to disable one of the graphic cards. You could find additional information in this blog dedicated to Linux hybrid graphics.