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Hi Richard |
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|
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I assume you've got the cpufreq-utils installed and running. What you |
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can do is (as root): |
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|
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$cpufreq-info |
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|
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This will give you some information about your CPU. It looks something |
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like this: |
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|
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cpufrequtils 0.4: cpufreq-info (C) Dominik Brodowski 2004 |
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Report errors and bugs to linux@×××××.de, please. |
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analyzing CPU 0: |
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driver: centrino |
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CPUs which need to switch frequency at the same time: 0 |
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hardware limits: 800 MHz - 1.87 GHz |
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available frequency steps: 1.87 GHz, 1.60 GHz, 1.33 GHz, 1.07 GHz, 800 MHz |
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[snip] |
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|
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The most interesting part is "avaiable frequency steps". |
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|
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Now you can change the upper bound to a lower level with |
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|
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$cpufreq-set -u 800000 |
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|
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This will set the upper bound to 800MHz. This means you're CPU can't get |
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"faster" as this. I've you need more, you simply change the upper bound. |
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|
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Another battery saving tip: set the powermode of your GPU lower and you |
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will get another 20-30 minutes ;) |
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|
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I hope this will help. This is my way of throttling the power. Isn't as |
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nice as the power managment guide says, but it works :-) |
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|
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Richard Watson wrote: |
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> Hi - I've been setting my laptop for power management by following the |
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> Power Management Guide and have successfully got cpufreqd running. |
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> However the CPU still gets hot on large compiles. I thought maybe |
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> changing the throttling state would cool things off but when I run the |
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> command from the power management guide |
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> |
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> echo -n "0:T1" > /proc/acpi/processor/C000/limit |
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> |
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> it returns the error |
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> |
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> -bash: echo: write error: Invalid argument |
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> |
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> I tried opening the file with nano -w and got the same message when |
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> saving the changes. Can anybody give me any help? |
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> |
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> Thanks, Richard |
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-- |
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