Setting Fan speed for AMD GPUs under linux

If you need to set the fan speed for your ATI / AMD card manually for whatever reason, this is how it is done. I assume you have the fglrx drivers installed and configured correctly.

Type in terminal the following line (including quotes):

aticonfig --pplib-cmd "get fanspeed 0"

This command fetches the current fan speed.

Set the speed to something higher using this command:

aticonfig --pplib-cmd "set fanspeed 0 X"

X is the fan speed %.  In both commands 0 represents the first video card in the system.