Document many of the sysctls in acpi. Bump the date on acpi_thermal.4
because I forgot to on the last change. MFC after: 1 day
This commit is contained in:
Nate Lawson
parent
d1b16e1864
commit
93870c0550
@ -25,7 +25,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd May 1, 2006
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.Dd July 29, 2006
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.Dt ACPI 4
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.Os
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.Sh NAME
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@ -57,13 +57,13 @@ compiled into the kernel on platforms where ACPI is mandatory.
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The
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.Nm
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driver is intended to provide power management without user intervention.
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Thus, some of these sysctls are controlled automatically by the
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.Pa power_profile
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.Xr rc 8
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script, which can be configured via
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.Xr rc.conf 5 .
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If values are specified manually, they may be overridden.
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If the default settings are not optimal, the following sysctls can be
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used to modify or monitor
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.Nm
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behavior.
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.Bl -tag -width indent
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.It Va hw.acpi.acline
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AC line state (1 means online, 0 means on battery power).
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.It Va hw.acpi.cpu.cx_usage
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Debugging information listing the percent of total usage for each sleep state.
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The values are reset when
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@ -87,6 +87,66 @@ States greater than C3 provide even more power savings with the same
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semantics as the C3 state.
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Deeper sleeps provide more power savings but increased transition
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latency when an interrupt occurs.
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.It Va hw.acpi.disable_on_reboot
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Disable ACPI during the reboot process.
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Most systems reboot fine with ACPI still enabled, but some require
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exiting to legacy mode first.
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Default is 0, leave ACPI enabled.
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.It Va hw.acpi.handle_reboot
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Use the ACPI Reset Register capability to reboot the system.
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Default is 0, use legacy reboot support.
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Some newer systems require use of this register, while some only work
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with legacy rebooting support.
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.It Va hw.acpi.lid_switch_state
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Suspend state (S1-S5) to enter when the lid switch (i.e., a notebook screen)
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is closed.
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Default is NONE (do nothing).
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.It Va hw.acpi.power_button_state
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Suspend state (S1-S5) to enter when the power button is pressed.
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Default is S5 (power-off nicely).
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.It Va hw.acpi.reset_video
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Reset the video adapter from real mode during the resume path.
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Some systems need this help, others have display problems if it is enabled.
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Default is 0 (disabled).
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.It Va hw.acpi.s4bios
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Indicate whether the system supports S4BIOS.
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This means that the BIOS can handle all the functions of suspending the
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system to disk.
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Otherwise, the OS is responsible for suspending to disk (S4OS).
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Most current systems do not support S4BIOS.
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.It Va hw.acpi.sleep_button_state
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Suspend state (S1-S5) to enter when the sleep button is pressed.
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This is usually a special function button on the keyboard.
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Default is S3 (suspend-to-RAM).
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.It Va hw.acpi.sleep_delay
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Wait this number of seconds between preparing the system to suspend and
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actually entering the suspend state.
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Default is 1 second.
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.It Va hw.acpi.supported_sleep_state
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Suspend states (S1-S5) supported by the BIOS.
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.Bl -tag -width indent
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.It Va S1
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Quick suspend to RAM.
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The CPU enters a lower power state but most peripherals are left running.
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.It Va S2
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Lower power state than S1, but with the same basic characteristics.
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Not supported by many systems.
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.It Va S3
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Suspend to RAM.
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Most devices are powered off and the system stops running except for
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memory refresh.
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.It Va S4
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Suspend to disk.
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All devices are powered off and the system stops running.
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When resuming, the system starts as if from a cold power on.
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Not yet supported by
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.Fx
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unless S4BIOS is available.
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.It Va S5
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System shuts down cleanly and powers off.
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.El
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.It Va hw.acpi.verbose
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Enable verbose printing from the various ACPI subsystems.
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.El
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.Sh LOADER TUNABLES
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Tunables can be set at the
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@ -140,9 +200,24 @@ such code.
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.It Va hw.acpi.verbose
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Turn on verbose debugging information about what ACPI is doing.
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.It Va hw.pci.link.%s.%d.irq
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Override the interrupt to use.
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Override the interrupt to use for this link and index.
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This capability should be used carefully, and only if a device is not
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working with
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.Nm
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enabled.
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.Qq %s
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is the name of the link (e.g., LNKA).
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.Qq %d
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is the resource index when the link supports multiple IRQs.
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Most PCI links only have one IRQ resource, so the below form should be used.
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.It Va hw.pci.link.%s.irq
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Override the interrupt to use.
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This capability should be used carefully, and only if a device is not
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working with
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.Nm
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enabled.
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.Qq %s
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is the name of the link (e.g., LNKA).
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.El
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.Sh DISABLING ACPI
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Since ACPI support on different platforms varies greatly, there are many
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@ -477,3 +552,10 @@ If the
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.Nm
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driver is loaded as a module when it is already linked as part of the
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kernel, odd things may happen.
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.Pp
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Many BIOS versions have serious bugs that may cause system instability,
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break suspend/resume, or prevent devices from operating properly due to
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IRQ routing problems.
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Upgrade your BIOS to the latest version available from the vendor before
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deciding it's a problem with
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.Nm .
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@ -24,7 +24,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd December 27, 2003
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.Dd July 29, 2006
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.Dt ACPI_THERMAL 4
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.Os
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.Sh NAME
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