Datasheet

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17
Power Management
Power Management
This chapter provides an overview of the various power management tech-
nologies in Linux. The configuration of all available APM (advanced power
management), ACPI (advanced configuration and power interface), and
CPU frequency scaling settings are described in detail.
I S/390, zSeries
The features and hardware described in this chapter do not exist on IBM
S/390 and zSeries, rendering this chapter irrelevant for these platforms. J
17.1 Power Saving Functions . . . . . . . . . . . . . . . 358
17.2 APM . . . . . . . . . . . . . . . . . . . . . . . . . . . 360
17.3 ACPI . . . . . . . . . . . . . . . . . . . . . . . . . . . 362
17.4 Rest for the Hard Disk . . . . . . . . . . . . . . . . . 368
17.5 powersave . . . . . . . . . . . . . . . . . . . . . . . 369
17.6 The YaST Power Management Module . . . . . . . 375
17.7 WOL — Wake on LAN . . . . . . . . . . . . . . . . 376