I've installed Linux Mint 17, most important thing for me is to lower the fan speed to 30% as I am doing in Windows because it's really too noisy. Note that the temperature stays at ~50°, so this shouldn't be a heating issue.
The problem is the only drivers available are for Xorg 6.9 to Xserver 1.12 and Kernel version up to 3.4 to the latest.
Is there a way to reduce fan speed without installing ATI drivers?
I was doing it before by using the command
I have an ATI HD 4870, 512MB on a desktop computer.
My scaling governor is set to 'ondemand':
$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor ondemand