D57618.diff
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	diff --git a/sys/dev/acpica/acpi_thermal.c b/sys/dev/acpica/acpi_thermal.c
	--- a/sys/dev/acpica/acpi_thermal.c
	+++ b/sys/dev/acpica/acpi_thermal.c
	@@ -121,6 +121,7 @@
	int tz_cooling_active;
	int tz_cooling_updated;
	int tz_cooling_saved_freq;
	+ bool tz_eval_temp_failed;
	};

	#define TZ_ACTIVE_LEVEL(act) ((act) >= 0 ? (act) : TZ_NUMLEVELS)
	@@ -474,6 +475,8 @@
	ACPI_STATUS status;

	ACPI_FUNCTION_NAME ("acpi_tz_get_temperature");
	+ if (sc->tz_eval_temp_failed)
	+ return (FALSE);

	/* Evaluate the thermal zone's _TMP method. */
	status = acpi_GetInteger(sc->tz_handle, acpi_tz_tmp_name, &temp);
	@@ -481,6 +484,7 @@
	ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
	"error fetching current temperature -- %s\n",
	AcpiFormatException(status));
	+ sc->tz_eval_temp_failed = true;
	return (FALSE);
	}