acpi_tz0: _TMP value is absurd, ignored

[Warren Block]

On an HP Pavilion a1750y, this message repeats at ten-second intervals:

kernel: acpi_tz0: _TMP value is absurd, ignored (-270.6C)
kernel: acpi_tz0: _TMP value is absurd, ignored (-270.5C)
kernel: acpi_tz0: _TMP value is absurd, ignored (-270.7C)

The asl has three errors, although none of them are in _TZ.

A couple of excerpts from the asl file:

     Method (RTMP, 0, NotSerialized)
     {
         Return (RBYT (0x74))
     }
...

             Method (_TMP, 0, NotSerialized)
             {
                 And (SENF, 0x01, Local6)
                 If (LEqual (Local6, 0x01))
                 {
                     Return (RTMP ())
                 }
                 Else
                 {
                     Return (0x0B86)
                 }
             }

What's the next step?