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 };