1power.conf(4) File Formats power.conf(4)
2
6 power.conf - Power Management configuration information file
7
9 /etc/power.conf
10
13 The power.conf file is used by the Power Management configuration pro‐
14 gram pmconfig(1M), to initialize the settings for Power Management. If
15 you make changes to this file, you must run pmconfig(1M) manually for
16 the changes to take effect.
17 The dtpower(1M) GUI allows the configuration of a subset of parameters
20 allowed by this file. For ease-of-use, it is recommended that you use
21 dtpower(1M) to configure the parameters. See the EXAMPLES section for
22 information on disabling Power Management.
23 Power Management addresses two specific management scenarios: manage‐
26 ment of individual devices and management of the whole system. An indi‐
27 vidual device is power managed if the device supports multiple power
28 levels and if the device driver uses Power Management interfaces pro‐
29 vided by the kernel to save device power when the device is idle.
30 All entries in the power.conf file are processed in the order that they
33 occur in the file.
34 Automatic Device Power Management
36 Devices with drivers that use the automatic device Power Management
37 interfaces are automatically power managed if the autopm entry is
38 enabled. The autopm entry is described near the end of this section.
39 The pm-components property describes the Power Management model of a
40 device driver to the Power Management framework. See pm-components(9P)
41 for more information.
42 When a component has been idle at a given power level for its threshold
45 time, the power level of the component is reduced to the next lower
46 power level of that component, if any. For devices which implement mul‐
47 tiple components, each component is power-managed independently.
48 Default thresholds for components of automatically power managed
51 devices are computed by the Power Management framework based on the
52 system idleness threshold. By default, all components of the device are
53 powered off if they have all been idle for the system's idleness
54 threshold. The default system idleness threshold is determined by the
55 applicable United States Environmental Protection Agency's (EPA) Energy
56 Star Memorandum of Understanding. See the NOTES section of this manual
57 page for more information.
58 To set the system idleness threshold, use one of the following entries:
61 system-threshold threshold
63 system-threshold always-on
66 where threshold is the value of the system idleness threshold in hours,
70 minutes or seconds as indicated by a trailing h, m or s (defaulting to
71 seconds if only a number is given). If always-on is specified, then by
72 default, all devices are left at ful