[ltp] C4 state on x60s - any news?

Thu, 17 May 2007 10:10:18 +0200

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i heard the following, please correct me if i'm totally wrong:
windoom has some problems with states >C3 so the bios hides these from=20
the OS.
also in states >C3 the cache will eventually lose data or become=20
inconsistent, so we don't go there normally. if you see C4 in your=20
/proc/bla/whatever after a suspend/resume cycle the bios was not quick=20
enough to hide this state

and now flame me and tell me it's all crap

Guillermo Ju=C3=A1rez schrieb:
> I read something about it in the linuxpowertop mailing list. Someone
> said some bios hide some C levels to the operating system. So maybe we
> are using C4 but the systems is offering us a mixed view of C3 and C4
> together.
>=20
> On 5/17/07, Henrique de Moraes Holschuh <hmh@hmh.eng.br> wrote:
>> On Wed, 16 May 2007, Stefan Blum wrote:
>> > KDE. Now what strikes me is that the cpus only go as far as C3, and =
C4
>>
>> The Cx levels you see are ACPI-mapped ones.  C4 in thinkpads might be =
the
>> CPU's C8 for all we know.  One would need to check some ACPI tables to=
=20
>> know
>> about it exactly (unless the kernel is exporting the mapping somewhere=
).
>>
>> And usually, you only get C4 when on battery.
>>
>> --=20
>>   "One disk to rule them all, One disk to find them. One disk to bring=

>>   them all and in the darkness grind them. In the Land of Redmond
>>   where the shadows lie." -- The Silicon Valley Tarot
>>   Henrique Holschuh
>> --=20
>> The linux-thinkpad mailing list home page is at:
>> http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad
>>
>=20
>=20

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