Ubuntu优化CPU的工作频率，打开终端：
sudo apt-get install cpufrequtils
然后sudo chmod u+s /usr/bin/cpufreq-set
在系统启动程序startup application里面添加两条命令：
/usr/bin/cpufreq-set -c 0 -g conservative
/usr/bin/cpufreq-set -c 1 -g conservative
可以在启动后执行如下命令确认是否生效：
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
执行cpufreq-info 得到如下信息（电脑是双核的）
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0 1
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 10.0 us.
hardware limits: 1000 MHz - 2.00 GHz
available frequency steps: 2.00 GHz, 1.67 GHz, 1.33 GHz, 1000 MHz
available cpufreq governors: conservative, ondemand, userspace, powersave, performance
current policy: frequency should be within 1000 MHz and 2.00 GHz.
The governor "conservative" may decide which speed to use
within this range.
current CPU frequency is 1000 MHz.
cpufreq stats: 2.00 GHz:8.28%, 1.67 GHz:1.46%, 1.33 GHz:2.61%, 1000 MHz:87.64% (35285)
analyzing CPU 1:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0 1
CPUs which need to have their frequency coordinated by software: 1
maximum transition latency: 10.0 us.
hardware limits: 1000 MHz - 2.00 GHz
available frequency steps: 2.00 GHz, 1.67 GHz, 1.33 GHz, 1000 MHz
available cpufreq governors: conservative, ondemand, userspace, powersave, performance
current policy: frequency should be within 1000 MHz and 2.00 GHz.
The governor "conservative" may decide which speed to use
within this range.
current CPU frequency is 1000 MHz.
cpufreq stats: 2.00 GHz:8.88%, 1.67 GHz:0.99%, 1.33 GHz:1.57%, 1000 MHz:88.56% (35873)
更多Ubuntu相关信息见Ubuntu 专题页面 ?tid=2