I've have two more values that maybe should be debounced:
_AC0 = 2732

_TC1 = 1

_TC2 = 5
Index: acpitz.c

===================================================================

RCS file: /cvs/src/sys/dev/acpi/acpitz.c,v

retrieving revision 1.21

diff -u -r1.21 acpitz.c

--- acpitz.c    6 Jan 2008 18:06:50 -0000       1.21

+++ acpitz.c    7 Jan 2008 10:49:58 -0000

@@ -124,8 +124,8 @@

        }
        sc->sc_hot = acpitz_gettempreading(sc, "_HOT");

-       sc->sc_tc1 = acpitz_getreading(sc, "_TC1");

-       sc->sc_tc2 = acpitz_getreading(sc, "_TC2");

+       sc->sc_tc1 = acpitz_gettempreading(sc, "_TC1");

+       sc->sc_tc2 = acpitz_gettempreading(sc, "_TC2");

        sc->sc_psv = acpitz_gettempreading(sc, "_PSV");

        dnprintf(10, "%s: _HOT: %d _TC1: %d _TC2: %d _PSV: %d _TMP: %d "

            "_CRT: %d\n", DEVNAME(sc), sc->sc_hot, sc->sc_tc1, sc->sc_tc2,
acpitz0 at acpi0: critical temperature 105 degC

acpitz0: TZ00: failed to read _AC0

acpitz0: TZ00: failed to read _TC1

acpitz0: TZ00: failed to read _TC2

acpitz1 at acpi0: critical temperature 105 degC

acpitz1: TZ01: failed to read _AC0

acpitz1: TZ01: failed to read _TC1

acpitz1: TZ01: failed to read _TC2
--

see ya,

giovanni