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NetBSD 6.1.5 - man page for pmu (netbsd section 4)

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

     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 con-
     troller 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.

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

     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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