https://bugzilla.kernel.org/show_bug.cgi?id=42870





--- Comment #7 from Andreas Müller <g...@stapelspeicher.org>  2012-09-06 
12:21:02 ---
On that different states issue, I just looked that up the acpi-specs 5.0:

FADT/P_BLK:
"Processor power state support is symmetric when presented via the FADT and
P_BLK
 interfaces; OSPM assumes all processorts in a system support the same power
sta
tes. If processors have non-symmetric power state support, then the BIOS will
ch
oose and use the lowest common power states supported by all the processors in
t
he system through the FADT table." (p. 386)

_CST:
"With _CST each processor can have its own characteristics independent of other
processors. For example processor 0 can support C1, C2 and C3 while processor 1
supports only C1." (p.396)

That doesn't seem to be implemented for _CST. However, the initialization is
also only done for one cpu, as the update would do with this patch.

Each processor has its own correct state-information ((cpuidle_device) but
cpuidle (acpi_idle_driver) might not. It doesn't seem to hurt current systems
though.

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