acpi error messages

["Steven M. Bellovin" <smb%bellovin.org@localhost>]

Following a suspend/resume sequence on a Thinkpad T61, I'm seeing the
following messages:

        Jul 14 18:27:47 yellowstone /netbsd: ACPI Error (exmutex-0483): Cannot 
release Mutex [BATM], not acquired [20070320]
        Jul 14 18:27:47 yellowstone /netbsd: 
        Jul 14 18:27:47 yellowstone /netbsd: ACPI Error (psparse-0631): Method 
parse/execution failed [\_SB_.PCI0.LPC_.EC__.GBST] (Node 0xffff80000638e640), 
AE_AML_MUTEX_NOT_ACQUIRED
        Jul 14 18:27:47 yellowstone /netbsd: ACPI Error (psparse-0631): Method 
parse/execution fai
        Jul 14 18:27:47 yellowstone /netbsd: led 
[\_SB_.PCI0.LPC_.EC__.BAT1._BST] (Node 0xffff80000638e380), 
AE_AML_MUTEX_NOT_ACQUIRED
        Jul 14 18:27:47 yellowstone /netbsd: acpibat1: failed to evaluate _BST: 
AE_AML_MUTEX_NOT_ACQUIRED

What do they mean?  If it matters, I have two batteries installed and I'm
running on battery now.

This is -current as of 12 April.

                --Steve Bellovin, http://www.bellovin.org