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Improve quoting of the S1-S5 states. Suggested by yar@.

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Add a workaround for conflicts between ACPI Cx CPU idling and LAPIC timer.

MFC after:	1 day
This commit is contained in:
Nate Lawson 2006-08-04 07:19:01 +00:00
parent 10c09f3f61
commit 13a8aa9f71
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=160962
1 changed files with 47 additions and 17 deletions
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64
share/man/man4/acpi.4
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@ -98,51 +98,69 @@ Default is 0, use legacy reboot support.
Some newer systems require use of this register, while some only work
with legacy rebooting support.
.It Va hw.acpi.lid_switch_state
Suspend state (S1-S5) to enter when the lid switch (i.e., a notebook screen)
is closed.
Suspend state
.Pq Dv S1 Ns No \- Ns Dv S5
to enter when the lid switch (i.e., a notebook screen) is closed.
Default is NONE (do nothing).
.It Va hw.acpi.power_button_state
Suspend state (S1-S5) to enter when the power button is pressed.
Default is S5 (power-off nicely).
Suspend state
.Pq Dv S1 Ns No \- Ns Dv S5
to enter when the power button is pressed.
Default is
.Dv S5
(power-off nicely).
.It Va hw.acpi.reset_video
Reset the video adapter from real mode during the resume path.
Some systems need this help, others have display problems if it is enabled.
Default is 0 (disabled).
.It Va hw.acpi.s4bios
Indicate whether the system supports S4BIOS.
Indicate whether the system supports
.Dv S4BIOS .
This means that the BIOS can handle all the functions of suspending the
system to disk.
Otherwise, the OS is responsible for suspending to disk (S4OS).
Most current systems do not support S4BIOS.
Otherwise, the OS is responsible for suspending to disk
.Pq Dv S4OS .
Most current systems do not support
.Dv S4BIOS .
.It Va hw.acpi.sleep_button_state
Suspend state (S1-S5) to enter when the sleep button is pressed.
Suspend state
.Pq Dv S1 Ns No \- Ns Dv S5
to enter when the sleep button is pressed.
This is usually a special function button on the keyboard.
Default is S3 (suspend-to-RAM).
Default is
.Dv S3
(suspend-to-RAM).
.It Va hw.acpi.sleep_delay
Wait this number of seconds between preparing the system to suspend and
actually entering the suspend state.
Default is 1 second.
.It Va hw.acpi.supported_sleep_state
Suspend states (S1-S5) supported by the BIOS.
Suspend states
.Pq Dv S1 Ns No \- Ns Dv S5
supported by the BIOS.
.Bl -tag -width indent
.It Va S1
.It Dv S1
Quick suspend to RAM.
The CPU enters a lower power state but most peripherals are left running.
.It Va S2
Lower power state than S1, but with the same basic characteristics.
.It Dv S2
Lower power state than
.Dv S1 ,
but with the same basic characteristics.
Not supported by many systems.
.It Va S3
.It Dv S3
Suspend to RAM.
Most devices are powered off and the system stops running except for
memory refresh.
.It Va S4
.It Dv S4
Suspend to disk.
All devices are powered off and the system stops running.
When resuming, the system starts as if from a cold power on.
Not yet supported by
.Fx
unless S4BIOS is available.
.It Va S5
unless
.Dv S4BIOS
is available.
.It Dv S5
System shuts down cleanly and powers off.
.El
.It Va hw.acpi.verbose
@ -559,3 +577,15 @@ IRQ routing problems.
Upgrade your BIOS to the latest version available from the vendor before
deciding it's a problem with
.Nm .
.Pp
The
.Nm
CPU idle power management drive conflicts with the local APIC (LAPIC)
timer.
Disable APIC mode with
.Va hint.apic.0.disabled
or don't use the
.Dv C2
and
.Dv C3
states if APIC mode is enabled.