在/etc/init.d/boot.local里加一行：
echo low>/sys/class/drm/card0/device/power_profile
ATI Radeon显卡温度可以下降10～20度
sensors
acpitz-virtual-0
Adapter: Virtual device
temp1: +51.0°C (crit = +100.0°C)
radeon-pci-0100
Adapter: PCI adapter
temp1: +58.5°C
k10temp-pci-00c3
Adapter: PCI adapter
temp1: +50.6°C (high = +70.0°C)
(crit = +100.0°C, hyst = +95.0°C)