This fixes the HP G62 laptops interrupt pegging issues and doesn't break
the Dell E6500.

Please test this on all acpi machines you have.  I only want to know
about breakage and diffs between dmesg with and without this diff.

Test if you want this to make release!

Index: dsdt.c
===================================================================
RCS file: /cvs/src/sys/dev/acpi/dsdt.c,v
retrieving revision 1.176
diff -u -p -r1.176 dsdt.c
--- dsdt.c	28 Jul 2010 16:00:29 -0000	1.176
+++ dsdt.c	31 Jul 2010 21:38:02 -0000
@@ -1498,6 +1498,7 @@ char *aml_valid_osi[] = {
 	"Windows 2001 SP3",
 	"Windows 2001 SP4",
 	"Windows 2006",
+	"Windows 2009",
 	NULL
 };