port-amd64/38360: est disabled when booting from battery

[jmcneill%invisible.ca@localhost]

>Number:         38360
>Category:       port-amd64
>Synopsis:       est disabled when booting from battery
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Apr 03 15:50:00 +0000 2008
>Originator:     Jared D. McNeill
>Release:        NetBSD 4.99.58
>Organization:
        
>Environment:
        
        
System: NetBSD black.invisible.ca 4.99.58 NetBSD 4.99.58 (GENERIC) #27: Sun Mar 
30 12:11:52 EDT 2008 
jmcneill%black.invisible.ca@localhost:/export/home/jmcneill/branches/HEAD/src/sys/arch/amd64/compile/GENERIC
 amd64
Architecture: x86_64
Machine: amd64
>Description:
        On my Thinkpad T61, when I boot with the AC adapter unplugged, I
        lose est support:

          $ sysctl machdep.est
          sysctl: second level name 'est' in 'machdep.est' is invalid

>How-To-Repeat:
        Boot from battery on a Thinkpad T61, notice that machdep.est
        messages are not present.
>Fix:
        

>Unformatted: