Frequency scaling with SU2300

[wysiwyg31]

Hello,

I have a DM1 which I switch to linux as soon as I received it.

At the moment, I face some issue to activate the frequency scaling ( Intel Enhanced Speedstep ).

It said me that my CPU doesnt support this but the specification tells it does ( http://ark.intel.com/Product.aspx?id=42779 )

Does windows users can tells me if frequency gets down when computer has nothing to do ? (I checked on a friend of mine during a few minutes, it was stuck at 1.2GHz).

Does any linux user has some information regarding frequency scaling on SU2300 ?

[surf2fr]

Frequency is definitevely stuck to 1.2.
No way to speed down.
I don't understand too considering intel spec gives enahnced speedstep for this cpu !!!!

[paco]

Hi

I also tried to install Linux on Hp pavilion dm1-1010el (with SU2300), but frequency scaling does not work.
I mailed HP that said me that my CPU uses the C state Frequency control (C0->C4) where C0 means that CPU is running under full workload, C4 is the most idle state.

Moreover voltage is managed by the speedstep technology (for what i can see only 2 voltages are avaiable).

I've tried to use Linux 2.6.34 which contains a patch to correct some acpi issues on some HP models (https://bugzilla.kernel.org/show_bug.cgi?id=15801) and that's what I observe:
- still no cpufreq module seems to work (so Freq is always 1200) but I'm not sure that a cpufreq driver is needed because I'm not sure effective frequency scaling is supported by this CPU (http://scottiestech.info/2009/12/31/the ... u-know-it/)
- C States are recognized but only 3 of them (C0->C2)
- System always use C0 state => no C state power saving
- The BIOS has some "bugs" that prevent it to fully communicate with the OS: some entries of the DSDT does not return any value if the running OS is non Windows
- PowerTop goes segmentation fault
- Throttling is fully supported but it is not usefull for powersaving
- Battery life under Linux seems to be reduced than under Win7n but is only my impression (i do not use a timer); it approximatelly survives for 4,5 hours

I'm not so expert in CPU clock scaling and other power saving technology so I don't really know if the problem is real or if Linux goes well and no CPU frequency scaling is needed for this processor.

PS: I would like to know a windows software to monitorate frequency and C State usage to understand the real CPU behavior under the factory installed OS and compare it with the Linbux one.

Greetings