kern/97383: Volume buttons on IBM Thinkpad crash system with ACPI

Henrik Brix Andersen henrik at
Fri Jun 30 17:51:11 UTC 2006

The following reply was made to PR kern/97383; it has been noted by GNATS.

From: Henrik Brix Andersen <henrik at>
To: bug-followup at, fotios at
Subject: Re: kern/97383: Volume buttons on IBM Thinkpad crash system with ACPI
Date: Fri, 30 Jun 2006 19:10:37 +0200

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 I can reproduce this problem with FreeBSD 6.1-RELEASE on my IBM
 ThinkPad X31.
 Whenever I attempt to access the hardware through ACPI, either by
 powering down (shutdown -h now), rebooting (shutdown -r now), loading
 the acpi_ibm kernel module (kldload acpi_ibm), pressing the volume
 keys etc, the system locks up with no sign as to why.
 I have found many postings on various mailing lists (see e.g. [1] and
 [2]) that suggest using PS2.EXE from IBM to disable the secondary IDE
 channel, but I have yet to find a way to try that as I do not have
 access to a Microsoft Windows environment.
 Henrik Brix Andersen <henrik at>
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