I already noticed that many people have the same or similar issue, like here but I found no decent answers so far.
I have a reliable but very slow Asus eeepc 901. In all the previous ubuntu versions I had on this netbook locking CPU speed to maximum (1.6Ghz) worked flawlessly. After the update to 12.04, the best I can get is "performance", which as you can see from the cpu-info drops the speed to 1.3Ghz. I tried forcing the governor with
Code:
# cpufreq-set -u 1.6Ghz -d 1.6Ghz
and it sets the speed to 1.6Ghz for a random amount of time which can vary from 3 seconds to 5 minutes and then I have to repeat the command. This speed droping issue also occurs with 100% CPU usage which is really annoying. I guess I could write a script that repeats this command every 3 sec while the computer is active to make sure it stays at maximum, or I could just destroy all governors and leave only 1.60Ghz as available speed,
but is there a more elegant solution or at least an explanation why the speed drop occurs?
Code:
cpufrequtils 007: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpufreq@vger.kernel.org, please.
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 10.0 us.
hardware limits: 800 MHz - 1.60 GHz
available frequency steps: 1.60 GHz, 1.33 GHz, 1.07 GHz, 800 MHz
available cpufreq governors: conservative, ondemand, userspace, powersave, performance
current policy: frequency should be within 1.60 GHz and 1.60 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 1.60 GHz (asserted by call to hardware).
cpufreq stats: 1.60 GHz:60.39%, 1.33 GHz:39.61%, 1.07 GHz:0.00%, 800 MHz:0.00% (458)
analyzing CPU 1:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 1
CPUs which need to have their frequency coordinated by software: 1
maximum transition latency: 10.0 us.
hardware limits: 800 MHz - 1.60 GHz
available frequency steps: 1.60 GHz, 1.33 GHz, 1.07 GHz, 800 MHz
available cpufreq governors: conservative, ondemand, userspace, powersave, performance
current policy: frequency should be within 1.60 GHz and 1.60 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 1.60 GHz (asserted by call to hardware).
cpufreq stats: 1.60 GHz:59.61%, 1.33 GHz:40.39%, 1.07 GHz:0.00%, 800 MHz:0.00% (460)
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