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ACPIFAN(4)		 BSD Kernel Interfaces Manual		    ACPIFAN(4)

NAME
     acpifan — ACPI Fan

SYNOPSIS
     acpifan* at acpi?

DESCRIPTION
     The acpifan device driver supports fans possibly exposed by the BIOS.
     Even if a system contains only one physical fan, multiple acpifan
     instances may be present.	In such cases each acpifan typically repre‐
     sents an acpitz(4) thermal zone, and the combined state of all instances
     reveals the speed of the fan.

     The acpifan driver does not support controlling the fan.  The current
     state (on or off) is made available through the envsys(4) API and the
     envstat(8) command.

SEE ALSO
     acpi(4), acpitz(4)

HISTORY
     The acpifan device driver appeared in NetBSD 6.0.

AUTHORS
     Jukka Ruohonen ⟨jruohonen@iki.fi⟩

BUGS
     The acpifan driver does not yet support additional functionality intro‐
     duced in the ACPI 4.0 specification.

BSD				January 9, 2011				   BSD

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