Hi -
on my laptop (Dell Latitude), running a kernel with
ACPI_DEBUG enabled, I get a warning at boot time and
a bunch of warnings every couple of minutes:

What's going on here. Do I have to worry?

best regards
Matthias

[boot messages]
acpitz0 at acpi0: ACPI Thermal Zone
acpitz0: unable to get polling interval; using default of 30.0s
acpitz0: failed to evaluate _AC0: AE_NOT_FOUND
acpitz0: failed to evaluate _AC1: AE_NOT_FOUND
acpitz0: failed to evaluate _AC2: AE_NOT_FOUND
acpitz0: failed to evaluate _AC3: AE_NOT_FOUND
acpitz0: failed to evaluate _AC4: AE_NOT_FOUND
acpitz0: failed to evaluate _AC5: AE_NOT_FOUND
acpitz0: failed to evaluate _AC6: AE_NOT_FOUND
acpitz0: failed to evaluate _AC7: AE_NOT_FOUND
acpitz0: failed to evaluate _AC8: AE_NOT_FOUND
acpitz0: failed to evaluate _AC9: AE_NOT_FOUND
acpitz0: passive cooling mode only
acpitz0: failed to evaluate _HOT: AE_NOT_FOUND
acpitz0: failed to evaluate _PSV: AE_NOT_FOUND
acpitz0: failed to evaluate _TC1: AE_NOT_FOUND
acpitz0: failed to evaluate _TC2: AE_NOT_FOUND
acpitz0: critical 94.0C

[at runtime]
acpitz0: failed to evaluate _AC0: AE_NOT_FOUND
acpitz0: failed to evaluate _AC1: AE_NOT_FOUND
acpitz0: failed to evaluate _AC2: AE_NOT_FOUND
acpitz0: failed to evaluate _AC3: AE_NOT_FOUND
acpitz0: failed to evaluate _AC4: AE_NOT_FOUND
acpitz0: failed to evaluate _AC5: AE_NOT_FOUND
acpitz0: failed to evaluate _AC6: AE_NOT_FOUND
acpitz0: failed to evaluate _AC7: AE_NOT_FOUND
acpitz0: failed to evaluate _AC8: AE_NOT_FOUND
acpitz0: failed to evaluate _AC9: AE_NOT_FOUND
acpitz0: failed to evaluate _HOT: AE_NOT_FOUND
acpitz0: failed to evaluate _PSV: AE_NOT_FOUND
acpitz0: failed to evaluate _TC1: AE_NOT_FOUND
acpitz0: failed to evaluate _TC2: AE_NOT_FOUND