From owner-freebsd-acpi@FreeBSD.ORG  Wed May  5 11:45:51 2010
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From: Rui Paulo <rpaulo@FreeBSD.org>
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To: Demelier David <demelier.david@gmail.com>
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Cc: Giovanni Trematerra <giovanni.trematerra@gmail.com>,
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Subject: Re: Kernel panic when unpluggin AC adaptor
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Please try this patch:

Index: acpi_cpu.c
===================================================================
--- acpi_cpu.c	(revision 207322)
+++ acpi_cpu.c	(working copy)
@@ -997,12 +997,12 @@
     if (notify != ACPI_NOTIFY_CX_STATES)
 	return;
 
+    ACPI_SERIAL_BEGIN(cpu);
     /* Update the list of Cx states. */
     acpi_cpu_cx_cst(sc);
     acpi_cpu_cx_list(sc);
 
     /* Update the new lowest useable Cx state for all CPUs. */
-    ACPI_SERIAL_BEGIN(cpu);
     cpu_cx_count = 0;
     for (i = 0; i < cpu_ndevices; i++) {
 	isc = device_get_softc(cpu_devices[i]);


Regards,
--
Rui Paulo