i386/89376: cmbat related ACPI change between 6.0-release and Nov 10th -stable sources is making Dell laptops to hang

[Pierre-Luc Drouin]

>Number:         89376
>Category:       i386
>Synopsis:       cmbat related ACPI change between 6.0-release and Nov 10th -stable sources is making Dell laptops to hang
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Nov 21 15:50:25 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     Pierre-Luc Drouin
>Release:        6.0-STABLE
>Organization:
none
>Environment:
FreeBSD 6.0-STABLE FreeBSD 6.0-STABLE #13: Sun Nov 20 12:54:29 EST 2005
>Description:
Because of an cmbat related ACPI change between 6.0-release and Nov 10th -stable sources, recent Dell laptops as the Precision M70 hang for about 1-2 seconds everytime a battery monitoring tool asks for the cmbat battery status. The problem did not exist with 6.0-release, it has been caused by some code change between -release and Nov 10th sources. Disabling cmbat with debug.acpi.disabled avoids the laptop to hang. Disabling smbat has no effect.
>How-To-Repeat:
The problem can be repeated by running "acpiconf -i loop" or "sysctl hw.acpi.battery.life". 
>Fix:
Unknown, sorry
>Release-Note:
>Audit-Trail:
>Unformatted: