docs/147180: Fix manpage of acpi(4): No need to disable the whole APIC subsystem for CPU idle states C3 and deeper

[Tobias Rehbein]

>Number:         147180
>Category:       docs
>Synopsis:       Fix manpage of acpi(4): No need to disable the whole APIC subsystem for CPU idle states C3 and deeper
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-doc
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          doc-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat May 29 10:30:08 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Tobias Rehbein
>Release:        FreeBSD 8.0-RELEASE-p2 i386
>Organization:
>Environment:
System: FreeBSD sushi.pseudo.local 8.0-RELEASE-p2 FreeBSD 8.0-RELEASE-p2 #5: Fri Jan 15 19:16:49 CET 2010 tobi at sushi.pseudo.local:/usr/obj/usr/src/sys/SUSHI i386


	
>Description:
	
        Since http://svn.freebsd.org/changeset/base/191720 it's no longer needed to disable the whole APIC
        subsystem to use CPU idle states C3 and deeper, it's sufficient to disable the LAPIC timer. I cc'ed
        mav@ who implemented this feature to veto this PR if my statement is invalid.

        Also I'm quite sure the LAPIC conflicts are not relevant for CPU idle state C2 but only for C3 and
        deeper.
>How-To-Repeat:
	
>Fix:

	

--- share_man_man4_acpi.4.diff begins here ---
--- /usr/src/share/man/man4/acpi.4	2009-11-26 20:09:36.000000000 +0100
+++ share/man/man4/acpi.4	2010-05-29 12:16:21.000000000 +0200
@@ -592,10 +592,8 @@
 .Nm
 CPU idle power management drive conflicts with the local APIC (LAPIC)
 timer.
-Disable APIC mode with
-.Va hint.apic.0.disabled
+Disable the local APIC timer with
+.Va hint.apic.0.clock=0
 or do not use the
-.Li C2
-and
 .Li C3
-states if APIC mode is enabled.
+and deeper states if the local APIC timer is enabled.
--- share_man_man4_acpi.4.diff ends here ---


>Release-Note:
>Audit-Trail:
>Unformatted: