put "echo dynpm > /sys/class/drm/card0/device/power_method" into the 
/etc/rc.d/rc.local is a simple workaround.
One of the developer of radeon responded me that the dynpm method may cause 
severe screen flick on some ATI cards while frequency changing, so the dynamic 
power manager is disabled as default in order to maintain stability. So you can 
test this command as root to find whether it causes problems on your laptop, 
and then put it into the start-up list for a permanent workaround or resolving.

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https://bugs.launchpad.net/bugs/748080

Title:
  ATI card fan is always on with opensource radeon driver

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