>Number:         37636
>Category:       port-i386
>Synopsis:       ACPI mutex errors on Thinkpad 600E
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Dec 28 16:50:02 +0000 2007
>Originator:     Greg Troxel
>Release:        NetBSD 4.99.45, sources updated 2007-12-28T500Z
>Organization:
>Environment:
	
	
System: NetBSD foo.ir.bbn.com 4.99.45 NetBSD 4.99.45 (GENERIC) #9: Wed Dec 26 17:27:15 EST 2007 gdt@fnord.ir.bbn.com:/n0/obj/gdt-current/i386/sys/arch/i386/compile/GENERIC i386
Architecture: i386
Machine: i386
>Description:

In dmesg, I get the following lines at irregular intervals that seem
to have a 30-second period, but not every 30s tick generates them.

ACPI Error (exmutex-0483): Cannot release Mutex [I2CM], not acquired [20070320]
ACPI Error (psparse-0631): Method parse/execution failed [\_SB_.PCI0.ISA0.EC0_.BAT0._BST] (Node 0xc1146680), AE_AML_MUTEX_NOT_ACQUIRED
acpibat0: failed to evaluate _BST: AE_AML_MUTEX_NOT_ACQUIRED


The machine is a Thinkpad 600E (2645-4AU).

>How-To-Repeat:

Simply running the system produces these often.  A sample from a fresh
boot (egrepping for exmutex-) to show the times more clearly:

Dec 28 09:48:45 foo /netbsd: ACPI Error (exmutex-0483): Cannot release Mutex [I2CM], not acquired [20070320]
Dec 28 09:50:45 foo /netbsd: ACPI Error (exmutex-0483): Cannot release Mutex [I2CM], not acquired [20070320]
Dec 28 09:51:16 foo /netbsd: ACPI Error (exmutex-0483): Cannot release Mutex [I2CM], not acquired [20070320]
Dec 28 09:52:16 foo /netbsd: ACPI Error (exmutex-0483): Cannot release Mutex [I2CM], not acquired [20070320]
Dec 28 09:53:45 foo /netbsd: ACPI Error (exmutex-0483): Cannot release Mutex [I2CM], not acquired [20070320]
Dec 28 09:55:16 foo /netbsd: ACPI Error (exmutex-0483): Cannot release Mutex [I2CM], not acquired [20070320]
Dec 28 09:55:45 foo /netbsd: ACPI Error (exmutex-0483): Cannot release Mutex [I2CM], not acquired [20070320]
Dec 28 09:56:46 foo /netbsd: ACPI Error (exmutex-0483): Cannot release Mutex [I2CM], not acquired [20070320]
Dec 28 09:57:16 foo /netbsd: ACPI Error (exmutex-0483): Cannot release Mutex [I2CM], not acquired [20070320]
Dec 28 09:57:46 foo /netbsd: ACPI Error (exmutex-0483): Cannot release Mutex [I2CM], not acquired [20070320]
Dec 28 09:59:16 foo /netbsd: ACPI Error (exmutex-0483): Cannot release Mutex [I2CM], not acquired [20070320]
Dec 28 09:59:46 foo /netbsd: ACPI Error (exmutex-0483): Cannot release Mutex [I2CM], not acquired [20070320]
Dec 28 10:01:16 foo /netbsd: ACPI Error (exmutex-0483): Cannot release Mutex [I2CM], not acquired [20070320]
Dec 28 10:01:46 foo /netbsd: ACPI Error (exmutex-0483): Cannot release Mutex [I2CM], not acquired [20070320]
Dec 28 10:02:16 foo /netbsd: ACPI Error (exmutex-0483): Cannot release Mutex [I2CM], not acquired [20070320]
Dec 28 10:02:46 foo /netbsd: ACPI Error (exmutex-0483): Cannot release Mutex [I2CM], not acquired [20070320]
Dec 28 10:03:16 foo /netbsd: ACPI Error (exmutex-0483): Cannot release Mutex [I2CM], not acquired [20070320]
Dec 28 10:05:16 foo /netbsd: ACPI Error (exmutex-0483): Cannot release Mutex [I2CM], not acquired [20070320]
Dec 28 10:06:16 foo /netbsd: ACPI Error (exmutex-0483): Cannot release Mutex [I2CM], not acquired [20070320]

>Fix: