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PMU(4)                       Device Drivers 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
     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

     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.

NetBSD 9.99                      May 14, 2007                      NetBSD 9.99