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 For details, take a look at <file:Documentation/cpu-freq/>.
23 config X86_POWERNOW_K8_ACPI
25 depends on X86_POWERNOW_K8 && ACPI_PROCESSOR
26 depends on !(X86_POWERNOW_K8 = y && ACPI_PROCESSOR = m)
29 config X86_SPEEDSTEP_CENTRINO
30 tristate "Intel Enhanced SpeedStep"
32 depends on ACPI_PROCESSOR
34 This adds the CPUFreq driver for Enhanced SpeedStep enabled
35 mobile CPUs. This means Intel Pentium M (Centrino) CPUs
36 or 64bit enabled Intel Xeons.
38 For details, take a look at <file:Documentation/cpu-freq/>.
42 config X86_SPEEDSTEP_CENTRINO_ACPI
44 depends on X86_SPEEDSTEP_CENTRINO
47 config X86_ACPI_CPUFREQ
48 tristate "ACPI Processor P-States driver"
49 depends on ACPI_PROCESSOR
51 This driver adds a CPUFreq driver which utilizes the ACPI
52 Processor Performance States.
54 For details, take a look at <file:Documentation/cpu-freq/>.
58 comment "shared options"
60 config X86_ACPI_CPUFREQ_PROC_INTF
61 bool "/proc/acpi/processor/../performance interface (deprecated)"
63 depends on X86_ACPI_CPUFREQ || X86_SPEEDSTEP_CENTRINO_ACPI || X86_POWERNOW_K8_ACPI
65 This enables the deprecated /proc/acpi/processor/../performance
66 interface. While it is helpful for debugging, the generic,
67 cross-architecture cpufreq interfaces should be used.
71 config X86_P4_CLOCKMOD
72 tristate "Intel Pentium 4 clock modulation"
75 This adds the clock modulation driver for Intel Pentium 4 / XEON
76 processors. When enabled it will lower CPU temperature by skipping
79 This driver should be only used in exceptional
80 circumstances when very low power is needed because it causes severe
81 slowdowns and noticeable latencies. Normally Speedstep should be used
84 For details, take a look at <file:Documentation/cpu-freq/>.
86 Unless you are absolutely sure say N.
89 config X86_SPEEDSTEP_LIB
91 default X86_P4_CLOCKMOD