1 .\" $NetBSD: pmu.4,v 1.2 2007/12/08 11:06:53 wiz Exp $
4 .\" Michael Lorenz. All rights reserved.
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32 .Nd support for Power Management Units found in all Apple laptops and some
33 desktop Power Macintosh computers
37 .Cd "battery* at pmu?"
38 .Cd "smartbat* at pmu?"
42 driver provides support for the Power Management Unit found in
43 Apple laptops and some desktop Power Macintosh computers.
44 Functions controlled by the PMU include the real time clock, ADB,
45 power, batteries, on some laptops like the PowerBook 3400c and
46 similar machines it also controls hotkeys and display brightness,
47 on others it provides an
49 bus and on some it controls CPU speed.
50 On many older machines it also provides access to some non-volatile
51 memory and thermal sensors.
52 Not all those features are present on all machines, for instance
53 Power Macintosh G4 and later machines don't have ADB, many more
54 recent laptops have display brightness and backlight control built
55 into the graphics controller instead of the PMU, only a few older
56 PowerBooks use the PMU for CPU speed control and newer machines
57 use a different way to access non-volatile memory.
58 However, all known PMUs so far provide a real time clock and power
61 Real time clock and power control are present and supported on all
64 ADB is supported when present.
66 .It Dv PowerBook 2400, 3400c, and 3500
67 Battery status and thermal sensors found on the mainboard and in
68 the battery pack are supported by the
70 driver, values can be read via
72 Hotkeys for brightness control are supported, CPU speed control
73 and parameter RAM are present but unsupported.
74 .It Dv Power Macintosh G4
77 is present but unsupported.
88 Some features are currently unsupported, like the
90 bus, access to parameter RAM and CPU speed control.