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# CPU Frequency scaling
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menu "CPU Frequency scaling"
config CPU_FREQ
bool "CPU Frequency scaling"
help
Clock scaling allows you to change the clock speed of CPUs on the
fly. This is a nice method to save battery power on notebooks,
because the lower the clock speed, the less power the CPU consumes.
For more information, take a look at linux/Documentation/cpu-freq or
at <http://www.codemonkey.org.uk/projects/cpufreq/>
If in doubt, say N.
source "drivers/cpufreq/Kconfig"
config CPU_FREQ_TABLE
tristate "CPU frequency table helpers"
depends on CPU_FREQ
default y
help
Many CPUFreq drivers use these helpers, so only say N here if
the CPUFreq driver of your choice doesn't need these helpers.
If in doubt, say Y.
comment "CPUFreq processor drivers"
depends on CPU_FREQ
config X86_ACPI_CPUFREQ
tristate "ACPI Processor P-States driver"
depends on CPU_FREQ_TABLE && ACPI_PROCESSOR
help
This driver adds a CPUFreq driver which utilizes the ACPI
Processor Performance States.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
config X86_ACPI_CPUFREQ_PROC_INTF
bool "/proc/acpi/processor/../performance interface (deprecated)"
depends on X86_ACPI_CPUFREQ && PROC_FS
help
This enables the deprecated /proc/acpi/processor/../performance
interface. While it is helpful for debugging, the generic,
cross-architecture cpufreq interfaces should be used.
If in doubt, say N.
config ELAN_CPUFREQ
tristate "AMD Elan"
depends on CPU_FREQ_TABLE && X86_ELAN
---help---
This adds the CPUFreq driver for AMD Elan SC400 and SC410
processors.
You need to specify the processor maximum speed as boot
parameter: elanfreq=maxspeed (in kHz) or as module
parameter "max_freq".
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
config X86_POWERNOW_K6
tristate "AMD Mobile K6-2/K6-3 PowerNow!"
depends on CPU_FREQ_TABLE
help
This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
AMD K6-3+ processors.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
config X86_POWERNOW_K7
tristate "AMD Mobile Athlon/Duron PowerNow!"
depends on CPU_FREQ_TABLE
help
This adds the CPUFreq driver for mobile AMD K7 mobile processors.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
config X86_POWERNOW_K8
tristate "AMD Opteron/Athlon64 PowerNow!"
depends on CPU_FREQ && EXPERIMENTAL
help
This adds the CPUFreq driver for mobile AMD Opteron/Athlon64 processors.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
config X86_GX_SUSPMOD
tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
depends on CPU_FREQ
help
This add the CPUFreq driver for NatSemi Geode processors which
support suspend modulation.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
config X86_SPEEDSTEP_CENTRINO
tristate "Intel Enhanced SpeedStep"
depends on CPU_FREQ_TABLE
help
This adds the CPUFreq driver for Enhanced SpeedStep enabled
mobile CPUs. This means Intel Pentium M (Centrino) CPUs.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
config X86_SPEEDSTEP_ICH
tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
depends on CPU_FREQ_TABLE
help
This adds the CPUFreq driver for certain mobile Intel Pentium III
(Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
ICH3 or ICH4 southbridge.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
config X86_SPEEDSTEP_SMI
tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
depends on CPU_FREQ_TABLE && EXPERIMENTAL
help
This adds the CPUFreq driver for certain mobile Intel Pentium III
(Coppermine), all mobile Intel Pentium III-M (Tualatin)
on systems which have an Intel 440BX/ZX/MX southbridge.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
config X86_P4_CLOCKMOD
tristate "Intel Pentium 4 clock modulation"
depends on CPU_FREQ_TABLE
help
This adds the CPUFreq driver for Intel Pentium 4 / XEON
processors.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
config X86_SPEEDSTEP_LIB
tristate
depends on (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
config X86_LONGRUN
tristate "Transmeta LongRun"
depends on CPU_FREQ
help
This adds the CPUFreq driver for Transmeta Crusoe processors which
support LongRun.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
config X86_LONGHAUL
tristate "VIA Cyrix III Longhaul"
depends on CPU_FREQ_TABLE
help
This adds the CPUFreq driver for VIA Samuel/CyrixIII,
VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
processors.
For details, take a look at linux/Documentation/cpu-freq.
If in doubt, say N.
endmenu