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Date: Tue, 20 Feb 2001 10:32:00 -0800 (PST)
From: is92518@e.cc.titech.ac.jp
To: freebsd-gnats-submit@FreeBSD.org
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Subject: kern/25235: OS Hungs up when using with a Battery of Laptop PC(Dynabook 2520JA).
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>Number:         25235
>Category:       kern
>Synopsis:       OS Hungs up when using with a Battery of Laptop PC(Dynabook 2520JA).
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Feb 20 10:40:01 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     Yoshisato YANAGISAWA
>Release:        4.2-STABLE("cvsup"ed at Feb. 18th,2001.)
>Organization:
Tokyo Institute of Technology. Dept. of Information Science.
>Environment:
FreeBSD shi-sanmei.pcc-software.org 4.2-STABLE FreeBSD 4.2-STABLE #0: Mon Feb 19 11:36:30 JST 2001     root@shi-sanmei.pcc-software.org:/usr/src/sys/compile/MYKERN  i386

>Description:
Whole system hungs up(symptons are such...no reaction to mouse moving and keybord typing,and no displaying of a screen) when running the machine with its battery on the kernel including ata(4) which is standard at 4.x-Releases and after.
I made sure this on "TOSHIBA Dynabook Satellite 2520CDSA".
It seems that if "CPU Sleep MODE(Battery setting of the machine's BIOS)" is Enabled,ata(4) doesn't work correctly.
>How-To-Repeat:
Enables "CPU Sleep MODE" at BIOS setting,and make the machine to work with its battery.
>Fix:
I found 2 solutions following...
1.
At BIOS setting,set "Battery Save Mode" to "User Setting" and Disables "CPU Sleep Mode".

2.
Use wdc(4) instead of ata(4).
!!Notice!!: wdc(4) doesn't exist at 5.x and after.
>Release-Note:
>Audit-Trail:
>Unformatted:

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