Re: [Mactel-linux-devel] [Mactel-linux-users] C4 state problem

[Sven A. <an...@an...>]

Len Brown schrieb:

>> #> cat /proc/acpi/processor/CPU?/power
>>
>> active state:            C3
>> max_cstate:              C8
>> bus master activity:     00000000
>> maximum allowed latency: 8000 usec
>> states:
>>     C1:                  type[C1] promotion[C2] demotion[--] latency[001]
>> usage[00002590] duration[00000000000000000000]
>>     C2:                  type[C2] promotion[C3] demotion[C1] latency[001]
>> usage[00002086] duration[00000000000006795863]
>>    *C3:                  type[C3] promotion[--] demotion[C2] latency[055]
>> usage[00003633] duration[00000000000009200376]
> 
> First note that there are "hardware C-states", and "ACPI C-states".
> The table above shows the ACPI C-states that the BIOS makes visible to the OS.
> 
> The BIOS (via the FADT or _CST) can map any hardware C-state it wants
> to ACPI C3.  It is likely that you are already getting hardware C4
> and simply skipping over hardware C3.
> 
> If you provide the complete raw output from acpidump, then it should be
> possible to tell.

As stated some lines below that, I found out, that ACPI C3 should be hardware C4E.
Can you confirm that?

Regards
 Sven

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