pmu
—
support for Power Management Units found in all Apple laptops
and some desktop Power Macintosh computers
pmu* at obio?
nadb* at pmu?
battery* at pmu?
smartbat* at pmu?
The pmu
driver provides support for the Power Management
Unit found in Apple laptops and some desktop Power Macintosh computers.
Functions controlled by the PMU include the real time clock, ADB, power,
batteries, on some laptops like the PowerBook 3400c and similar machines it
also controls hotkeys and display brightness, on others it provides an
iic(9) bus and on some it controls
CPU speed. On many older machines it also provides access to some non-volatile
memory and thermal sensors. Not all those features are present on all
machines, for instance Power Macintosh G4 and later machines don't have ADB,
many more recent laptops have display brightness and backlight control built
into the graphics controller instead of the PMU, only a few older PowerBooks
use the PMU for CPU speed control and newer machines use a different way to
access non-volatile memory. However, all known PMUs so far provide a real time
clock and power control.
Real time clock and power control are present and supported on all machines that
can run NetBSD/macppc, ADB is supported when present.
PowerBook
2400, 3400c, and 3500
- Battery status and thermal sensors found on the mainboard and in the
battery pack are supported by the
battery(4) driver, values
can be read via envsys(4).
Hotkeys for brightness control are supported, CPU speed control and
parameter RAM are present but unsupported.
Power
Macintosh G4
- ADB is not present, iic(9) is
present but unsupported.
Some features are currently unsupported, like the
iic(9) bus, access to parameter RAM
and CPU speed control.