intel_idle: disable NHM/WSM HW C-state auto-demotion

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Hardware C-state auto-demotion is a mechanism where the HW overrides
the OS C-state request, instead demoting to a shallower state,
which is less expensive, but saves less power.

Modern Linux should generally get exactly the states it requests.
In particular, when a CPU is taken off-line, it must not be demoted, else
it can prevent the entire package from reaching deep C-states.

https://bugzilla.kernel.org/show_bug.cgi?id=25252

Signed-off-by: Len Brown <len.brown@intel.com>

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This commit is contained in:

Len Brown 2011-01-18 20:48:27 -05:00

parent 100b33c8bd

commit 14796fca2b

2 changed files with 24 additions and 0 deletions

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drivers/idle/intel_idle.c

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