Hi,

  I'm attaching the acpidump output. Can someone (ACPI guys??) please
me help figure this out?
Is there any other info that's needed to debug this?

I can be a tester for this and even do some development within the
limits of my understanding.

Thanks,
SK

On Sun, Aug 3, 2008 at 3:31 AM, none <aj504@student.cs.york.ac.uk> wrote:
quoted text
> S K wrote:
>> Hi,
>>
>>   I have an Intel Core 2 Quad and running kernel
>> 2.6.25.11-97.fc9.i686. cpufreq doesn't seem to work. The cpufreq
>> scaling monitor in Gnome says CPU Freq scaling is not supported in my
>> CPU. The CPU can run at 2.0 and 2.5 GHz but mine always runs at 2.5
>> GHz in Linux.
>>
>> So I checked  /sys and there is no cpufreq dir in /sys/...
>>
>> # ls /sys/devices/system/cpu/
>> cpu0  cpu1  cpu2  cpu3  cpuidle  sched_mc_power_savings
>> # ls /sys/devices/system/cpu/cpuidle/
>> current_driver  current_governor_ro
>>
>> I have no clue what cpuidle directory is for.
>>
>> I added cpufreq.debug=7 in kernel boot params and saw the following in
>> the dmesg:
>>
>> speedstep-smi: No supported Intel CPU detected.
>> cpufreq-core: CPU 0: _PPC is 0 - frequency not limited
>> cpufreq-core: CPU 3: _PPC is 0 - frequency not limited
>> cpufreq-core: CPU 1: _PPC is 0 - frequency not limited
>> cpufreq-core: CPU 2: _PPC is 0 - frequency not limited
>> cpuidle: using governor ladder
>> cpuidle: using governor menu
>>
>> I looked at arch/x86/kernel/cpu/cpufreq/speedstep-smi.c and it seems
>> to detect only Pentium IIIs.
>>
>> Anyone know what files have the cpufreq code for Intel Core 2?
>> Does cpufreq support Intel Core 2 Quads? Especially the Q9300? If not,
>> anything I can do to help?
>
> I have an Intel Core 2 Duo and it uses the ACPI cpufreq driver; your
> Quad should do the same.  So this is likely an ACPI/BIOS issue.
>
> If you ask ACPI people they will ask you to post the output of acpidump.
> Also you should probably check if you have a BIOS option that needs to be
> enabled for this to work.
>
> BTW, cpuidle is something quite different, it is about how to save power
> when CPU is doing nothing (i.e. idle :-).  Cpu frequency scaling is how to
> save power when CPU is working (but doesn't need to run flat out).
>
> Alan
>