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 (deprecated)"
32 depends on ACPI_PROCESSOR
34 This is deprecated and this functionality is now merged into
35 acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
37 This adds the CPUFreq driver for Enhanced SpeedStep enabled
38 mobile CPUs. This means Intel Pentium M (Centrino) CPUs
39 or 64bit enabled Intel Xeons.
41 For details, take a look at <file:Documentation/cpu-freq/>.
45 config X86_SPEEDSTEP_CENTRINO_ACPI
47 depends on X86_SPEEDSTEP_CENTRINO
49 config X86_ACPI_CPUFREQ
50 tristate "ACPI Processor P-States driver"
52 depends on ACPI_PROCESSOR
54 This driver adds a CPUFreq driver which utilizes the ACPI
55 Processor Performance States.
56 This driver also supports Intel Enhanced Speedstep.
58 For details, take a look at <file:Documentation/cpu-freq/>.
62 comment "shared options"
64 config X86_ACPI_CPUFREQ_PROC_INTF
65 bool "/proc/acpi/processor/../performance interface (deprecated)"
67 depends on X86_ACPI_CPUFREQ || X86_SPEEDSTEP_CENTRINO_ACPI || X86_POWERNOW_K8_ACPI
69 This enables the deprecated /proc/acpi/processor/../performance
70 interface. While it is helpful for debugging, the generic,
71 cross-architecture cpufreq interfaces should be used.
75 config X86_P4_CLOCKMOD
76 tristate "Intel Pentium 4 clock modulation"
80 This adds the clock modulation driver for Intel Pentium 4 / XEON
81 processors. When enabled it will lower CPU temperature by skipping
84 This driver should be only used in exceptional
85 circumstances when very low power is needed because it causes severe
86 slowdowns and noticeable latencies. Normally Speedstep should be used
89 For details, take a look at <file:Documentation/cpu-freq/>.
91 Unless you are absolutely sure say N.
94 config X86_SPEEDSTEP_LIB
96 default X86_P4_CLOCKMOD