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Everytime the screen dims to save power after my laptop has been idle, the fan starts spinning really fast and the cpu temp rises to about 60 deg C. When I move the mouse to undim the screen, the fan returns back to normal.

I'm running Ubuntu 12.04 64-bit on Sony VAIO laptop

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This seems to be a bug. See here how to post a bug report – Ashu May 26 '12 at 17:17
I'm too lazy to report a bug – functionptr May 26 '12 at 18:15
Then im too sorry, no one else can help you. – Ashu May 26 '12 at 18:16… – Qasim Jun 14 '13 at 14:34
up vote 0 down vote accepted

If you don't have the time/skill to debug this, simply turn off screen dimming from "Brightness and Lock" in System Settings:

enter image description here

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thanks, that works for now – functionptr Jun 26 '12 at 19:06

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