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How to get SpeedStep work?


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#1
nyolc8

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Anyone can help me to get speedstep working?

I have these on the end with the bdmesg:

Read HFS+ file: [hd(0,4)/Extra/DSDT.aml] 15601 bytes.
Read HFS+ file: [hd(0,4)/Extra/SSDT.aml] 554 bytes.
Read HFS+ file: [hd(0,4)/Extra/SSDT-1.aml] 338 bytes.
Read HFS+ file: [hd(0,4)/Extra/SSDT-2.aml] 939 bytes.
ACPI table not found: SSDT-3.aml
FADT: Restart Fix applied!
FADT: Using custom DSDT!
Found ACPI CPU: CPU0
Found ACPI CPU: CPU1
Found ACPI CPU: CPU2
Found ACPI CPU: CPU3
SSDT with CPU C-States generated successfully
SSDT with CPU P-States generated successfully
RSDT: Added 5 SSDT table(s)
Starting Darwin x86_64
(I extracted the ssdt files with Everest on Windows and just copied them to /Extra. Is this right or do I need to modify something in them?)

In com.apple.Boot.plist I have
<key>GeneratePStates</key><string>Yes</string>
<key>GenerateCStates</key><string>Yes</string>
<key>dropSSDT</key><string>Yes</string>

I have this with SMC Monitor:
Attached File  K__perny__fot___2011_07_20___12.57.03.jpg   34.08KB   477 downloads
(So there is two states - In Windows it gets down to 2000 when not used.)

But the MHz is always 2666:
Attached File  K__perny__fot___2011_07_20___12.59.47.jpg   90.87KB   402 downloads

I have these kexts (all unmodified):
AppleIntelCPUPowerManagement - Loaded, Satisfied
AppleIntelCPUPowerManegementClient - Loaded, Satisfied
AppleHPET - Loaded, Satisfied
AppleLPC - Loaded, Satisfied
AppleRTC - Loaded, Satisfied

What else do I need to get this work?

#2
Noam AA

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you have a working speedstep
CPU-X does not display core speed, you can use SMC Monitor for this

#3
nyolc8

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Thanks for the reply, and how to set SMC Monitor to see this? Cause I can't get anything from it just the p-c states.

#4
amit_talkin

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I have same problem, never seen CPU frequency dropped from 3 GHZ on my i7 950.
tried various tools like SMC Monitor, MSR Dumper, TechTool etc..all shows stable 3 GHz frequency. I also have my DSDT, AppleIntelCPUPowerManagement also loading and working fine, also SMC monitor shows various P&C states info, but somehow system fails to lower the frequency!

#5
LucasIsEpic

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I have same problem, never seen CPU frequency dropped from 3 GHZ on my i7 950.
tried various tools like SMC Monitor, MSR Dumper, TechTool etc..all shows stable 3 GHz frequency. I also have my DSDT, AppleIntelCPUPowerManagement also loading and working fine, also SMC monitor shows various P&C states info, but somehow system fails to lower the frequency!



i'm pretty sure that i7s have an internal speedstep that does not report outside the chipset, also it means it works without kexts.
i might not be right on this but I'm pretty sure





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