2 # CPU Frequency scaling
5 menu "CPU Frequency scaling"
7 source "drivers/cpufreq/Kconfig"
11 comment "CPUFreq processor drivers"
13 config X86_POWERNOW_K8
14 tristate "AMD Opteron/Athlon64 PowerNow!"
17 This adds the CPUFreq driver for mobile AMD Opteron/Athlon64 processors.
19 To compile this driver as a module, choose M here: the
20 module will be called powernow-k8.
22 For details, take a look at <file:Documentation/cpu-freq/>.
26 config X86_POWERNOW_K8_ACPI
28 depends on X86_POWERNOW_K8 && ACPI_PROCESSOR
29 depends on !(X86_POWERNOW_K8 = y && ACPI_PROCESSOR = m)
32 config X86_SPEEDSTEP_CENTRINO
33 tristate "Intel Enhanced SpeedStep (deprecated)"
35 depends on ACPI_PROCESSOR
37 This is deprecated and this functionality is now merged into
38 acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
40 This adds the CPUFreq driver for Enhanced SpeedStep enabled
41 mobile CPUs. This means Intel Pentium M (Centrino) CPUs
42 or 64bit enabled Intel Xeons.
44 To compile this driver as a module, choose M here: the
45 module will be called speedstep-centrino.
47 For details, take a look at <file:Documentation/cpu-freq/>.
51 config X86_SPEEDSTEP_CENTRINO_ACPI
53 depends on X86_SPEEDSTEP_CENTRINO
55 config X86_ACPI_CPUFREQ
56 tristate "ACPI Processor P-States driver"
58 depends on ACPI_PROCESSOR
60 This driver adds a CPUFreq driver which utilizes the ACPI
61 Processor Performance States.
62 This driver also supports Intel Enhanced Speedstep.
64 To compile this driver as a module, choose M here: the
65 module will be called acpi-cpufreq.
67 For details, take a look at <file:Documentation/cpu-freq/>.
71 comment "shared options"
73 config X86_ACPI_CPUFREQ_PROC_INTF
74 bool "/proc/acpi/processor/../performance interface (deprecated)"
76 depends on X86_ACPI_CPUFREQ || X86_SPEEDSTEP_CENTRINO_ACPI || X86_POWERNOW_K8_ACPI
78 This enables the deprecated /proc/acpi/processor/../performance
79 interface. While it is helpful for debugging, the generic,
80 cross-architecture cpufreq interfaces should be used.
84 config X86_P4_CLOCKMOD
85 tristate "Intel Pentium 4 clock modulation"
89 This adds the clock modulation driver for Intel Pentium 4 / XEON
90 processors. When enabled it will lower CPU temperature by skipping
93 This driver should be only used in exceptional
94 circumstances when very low power is needed because it causes severe
95 slowdowns and noticeable latencies. Normally Speedstep should be used
98 To compile this driver as a module, choose M here: the
99 module will be called p4-clockmod.
101 For details, take a look at <file:Documentation/cpu-freq/>.
103 Unless you are absolutely sure say N.
106 config X86_SPEEDSTEP_LIB
108 default X86_P4_CLOCKMOD