error messages

[ivan dimitrov]

hi list,
on ttyv0 i am getting nonstop following messages:
 ACPI-0501: *** Error: Handler for [EmbeddedControl] returned AE_NO_HARDWARE_RESPONSE
    ACPI-1304: *** Error: Method execution failed [\\_SB_.C002.C003.C004.C158] (Node 0xc363e2a0), AE_NO_HARDWARE_RESPONSE
    ACPI-1304: *** Error: Method execution failed [\\_SB_.C158] (Node 0xc3642820), AE_NO_HARDWARE_RESPONSE
    ACPI-1304: *** Error: Method execution failed [\\_SB_.C15E._BST] (Node 0xc3642760), AE_NO_HARDWARE_RESPONSE

my question is - what they means and how to stop them ?

p.s.
the bsd is "FreeBSD HP500 6.2-RELEASE-p3 FreeBSD 6.2-RELEASE-p3 #2: Tue Mar 27 22:28:16 CEST 2007     root at sunset:/usr/obj/usr/src/sys/GENERIC  i386"
the computer is laptop HP500

thanks in  advance
i. 

       
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