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![]() It turns out that there is a bit in the _CST for Intel FFH C3 that tells the OS if we should be checking BM_STS or not. Linux has been unconditionally checking BM_STS. If the chip-set is configured to enable BM_STS, it can retard or completely prevent entry into deep C-states -- as illustrated by turbostat: http://userweb.kernel.org/~lenb/acpi/utils/pmtools/turbostat/ ref: Intel Processor Vendor-Specific ACPI Interface Specification table 4 "_CST FFH GAS Field Encoding" Bit 1: Set to 1 if OSPM should use Bus Master avoidance for this C-state https://bugzilla.kernel.org/show_bug.cgi?id=15886 Signed-off-by: Len Brown <len.brown@intel.com> |
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.. | ||
platform | ||
acexcep.h | ||
acnames.h | ||
acoutput.h | ||
acpi.h | ||
acpi_bus.h | ||
acpi_drivers.h | ||
acpi_numa.h | ||
acpiosxf.h | ||
acpixf.h | ||
acrestyp.h | ||
actbl.h | ||
actbl1.h | ||
actbl2.h | ||
actypes.h | ||
apei.h | ||
atomicio.h | ||
button.h | ||
container.h | ||
hed.h | ||
pdc_intel.h | ||
processor.h | ||
reboot.h | ||
video.h |