linux-kernel - Re: cpufreq doesn't seem to work in Intel Q9300

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Message-ID: <514e099a0808032206n192fc973u24b31def6555dbec@mail.gmail.com>
Date:	Sun, 3 Aug 2008 22:06:38 -0700
From:	"S K" <nospamnoham@...il.com>
To:	none <aj504@...dent.cs.york.ac.uk>
Cc:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: cpufreq doesn't seem to work in Intel Q9300

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@...dent.cs.york.ac.uk> wrote:
> 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
>

View attachment "acpidump.txt" of type "text/plain" (95188 bytes)