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On Wed, Dec 29, 2010 at 11:13 AM, Bill Longman <bill.longman@×××××.com> wrote: |
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> A strangeness I have noted is that /proc/cpuinfo has this for its power |
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> capabilities: |
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> power management: |
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> Nothing. |
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|
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FWIW I have Core i7 920, and it also has nothing in the power |
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management in cpuinfo, but CPU frequency scaling does work and speeds |
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change (using ondemand governor, in a desktop machine). |
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|
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$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_* |
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2661000 2660000 2527000 2394000 2261000 2128000 1995000 1862000 1729000 1596000 |
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conservative userspace powersave ondemand performance |
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1596000 |
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acpi-cpufreq |
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ondemand |
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2661000 |
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1596000 |
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<unsupported> |
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|
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So it seems similar to yours except that your max_freq and min_freq |
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are the same! Which matches what you say about it never going faster |
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than the minimum speed. |
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|
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In kernel docs Documentation/cpu-freq/cpu-drivers.txt there is some |
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information about how the min and max speed are set by the policy that |
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is in use (by whatever driver is controlling the scaling). So I don't |
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know if there is a userspace program (like KDE laptop stuff) that |
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might be overriding with its own faulty settings? |
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|
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Seems like your kernel settings are probably okay since you can see |
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all of that so far. If you run powertop can it see all of the C-states |
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and P-states without any problems? |
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