https://bugzilla.kernel.org/show_bug.cgi?id=15886





--- Comment #15 from Len Brown <[email protected]>  2010-07-25 03:17:18 ---
Iain,
Turbostat output shows that BIOS 07-24-2010 does not enter c3, pc3, pc6
and BIOS 05-15-2010 enters all of them.

This is independent of the "balanced" vs "oscontrol" BIOS setting.

So it appears that while the older BIOS didn't work well,
the newer BIOS is working fine.

Looking at the AML, the newer BIOS has Access Size 1 on _CST
no matter if balanced or oscontrol.
The older BIOS has Access Size 3 on C3-type _CST's.
Again, independent of "balanced" vs "oscontrol".
Of course you are running a kernel that doesn't look at _CST.GAS.Access Width,
so apparently the new BIOS is programming the chip-set to not assert BM_STS...

In summary, you have no problem with the new BIOS
and the lack of package c-states appears to be a problem associated
only w/ the old BIOS, yes?

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