Seems you really know what you're talking about...have you ever considered writing a short howto about this? I don't know too much about ACPI and the DSDT, nor PCI registers... Even a howto for advanced users would be useful I think because if you have it all summed up you can get the idea and read about details on some google-found websites for sure. I'd really appreciate a little howto as I do have a ICH8-M chipset which will be different to yours I guess ;)

Peter


Török Edvin wrote:
On 6/21/07, Florian Reitmeir <[EMAIL PROTECTED]> wrote:

it shows me max C3 in 2.6.21 , and 2.6.20 show me max. C4.

2.6.20 is not tickless IIRC, so C4 won't have a big impact.

If you had C4 in 2.6.20, but not in 2.6.21 I suggest to open a
bugreport on bugzilla.kernel.org.

Perhaps use acpidump to dump the _CST tables. It is a bit complicated
how to do that, you need to dump the SSDT, disassemble with iasl,
locate the CST physical address, and length, dump again from that
address, and decompile again.

Are you using same BIOS with 2.6.21 vs. 2.6.20?

--Edwin
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