Auto adjust fan speed of graphics card with ATI catalyst driver on Ubuntu.

fanny.rb

#!/usr/bin/env ruby 
# encoding: utf-8

# first part, get temperature
temp_str = `aticonfig --adapter=0 --od-gettemperature`
temp = temp_str.scan(/Sensor 0: Temperature - (\d+\.\d+) C/)[0][0].to_i

# determine fan speed
thresholds = [ 40, 60, 70, 80, 85 ] 
speeds =     [ 10, 25, 30, 35, 50 ]
speed = 100 # default speed

thresholds.each_with_index do |threshold, index|
  speed = speeds[index] and break if temp < threshold 
end

# set speed
`aticonfig --pplib-cmd "set fanspeed 0 #{speed}"`

puts "Temperature: #{temp}°C / Fan speed level: #{speed}%"