Copyright (c) 2006 Alexander Yurchenko <grange@openbsd.org>
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.Dd January 7, 2006 .Dt ACPI 4 .Os .Sh NAME .Nm acpi , .Nm acpibat , .Nm acpihpet , .Nm acpitimer .Nd Advanced Configuration and Power Interface .Sh SYNOPSIS .Cd "acpi0 at mainbus?" .Cd "acpibat* at acpi?" .Cd "acpihpet* at acpi?" .Cd "acpitimer* at acpi?"
p .Cd "option ACPIVERBOSE" .Cd "option ACPI_ENABLE" .Sh DESCRIPTION The .Nm driver provides basic support for ACPI including loading ACPI tables from the firmware, parsing and interpreting AML code, event handling, suspending and powering off, and attaching device drivers.
p The .Nm acpibat driver supports the ACPI Control Method Battery interface between the battery and the host. Information about the battery, such as capacity, recharge rate, voltage, and serial number, is available through this driver. Battery status is updated every 10 seconds.
p The .Nm acpihpet driver provides support for the high precision event timer to be used as a timecounter for the .Xr tc_init 9 framework.
p The .Nm acpitimer driver allows access to a power management timer through the ACPI. The timer is used as a timecounter for the .Xr tc_init 9 framework.
p If the configuration option .Dq Dv ACPIVERBOSE is set, information about all detected ACPI devices will be displayed on boot.
p If the configuration option .Dq Dv ACPI_ENABLE is set, the .Nm driver will take control of ACPI from the firmware (BIOS). WARNING: this may cause an overheating on some machines since .Nm doesn't provide any thermal or cooling control.
p Some devices, such as .Nm acpibat , provide hardware information via sensors that can be monitored using .Xr sysctl 8 or .Xr sensorsd 8 . .Sh SEE ALSO .Xr intro 4 , .Xr sensorsd 8 , .Xr sysctl 8 , .Xr tc_init 9 .Sh HISTORY The .Nm acpi , .Nm acpibat , .Nm acpihpet , and .Nm acpitimer drivers first appeared in .Ox 3.8 . .Sh AUTHORS .An -nosplit The .Nm acpi , .Nm acpihpet , and .Nm acpitimer drivers were written by .An Thorsten Lockert Aq tholo@sigmasoft.com . The .Nm acpibat driver was written by .An Marco Peereboom Aq marco@openbsd.org . .Sh BUGS Some systems do not propagate battery insertion up to the driver.
p Smart Battery Specification-based batteries are not supported.