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PMU(4)			 BSD Kernel Interfaces Manual			PMU(4)

NAME
     pmu — support for Power Management Units found in all Apple laptops and
     some desktop Power Macintosh computers

SYNOPSIS
     pmu* at obio?
     nadb* at pmu?
     battery* at pmu?
     smartbat* at pmu?

DESCRIPTION
     The pmu driver provides support for the Power Management Unit found in
     Apple laptops and some desktop Power Macintosh computers.	Functions con‐
     trolled by the PMU include the real time clock, ADB, power, batteries, on
     some laptops like the PowerBook 3400c and similar machines it also con‐
     trols 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 pro‐
     vides 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 dis‐
     play 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.

   Notes by model
     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.

SEE ALSO
     battery(4), cuda(4), nadb(4), nvram(4), obio(4), iic(9)

BUGS
     Some features are currently unsupported, like the iic(9) bus, access to
     parameter RAM and CPU speed control.

BSD				 May 14, 2007				   BSD

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