[ACPI-sppt] ACPI-0284: *** Error: No installed handler for fixed event [00000000]

I have 2 systems running 2.4.21-ac4. 

1st
ACPI: RSDP (v000 ASUS                       ) @ 0x000f7f00
ACPI: RSDT (v001 ASUS   P2B      22616.11825) @ 0x07ffd000
ACPI: FADT (v001 ASUS   P2B      22616.11825) @ 0x07ffd080
ACPI: BOOT (v001 ASUS   P2B      22616.11825) @ 0x07ffd040
ACPI: DSDT (v001   ASUS P2B      00000.04096) @ 0x00000000
ACPI: BIOS passes blacklist
ACPI: Subsystem revision 20030522

and 2nd
ACPI: RSDP (v000 ASUS                       ) @ 0x000f7980
ACPI: RSDT (v001 ASUS   P2-99    22616.11825) @ 0x07ffd000
ACPI: FADT (v001 ASUS   P2-99    22616.11825) @ 0x07ffd080
ACPI: BOOT (v001 ASUS   P2-99    22616.11825) @ 0x07ffd040
ACPI: DSDT (v001   ASUS P2-99    00000.04096) @ 0x00000000
ACPI: BIOS passes blacklist

both of them show randomly at boot (not every boot), 2 or 3 times, the
following message
ACPI-0284: *** Error: No installed handler for fixed event [00000000]
The message is not always in the same position, it's random.

I searched for it on google and come up with 2 matches; however in those
cases the kernel locked up, while in my case all seems normal.

So, should I worry about them?

Thanks.

esamples:
===
...
Floppy drive(s): fd0 is 1.44M
 evevent-0284: *** Error: No installed handler for fixed event [00000000]
...
00:0b.0: scatter/gather enabled. h/w checksums enabled
 evevent-0284: *** Error: No installed handler for fixed event [00000000]
...
===

=== dmesg|grep -i acpi
 BIOS-e820: 0000000007ffd000 - 0000000007fff000 (ACPI data)
 BIOS-e820: 0000000007fff000 - 0000000008000000 (ACPI NVS)
ACPI: have wakeup address 0xc0001000
ACPI: RSDP (v000 ASUS                       ) @ 0x000f7980
ACPI: RSDT (v001 ASUS   P2-99    22616.11825) @ 0x07ffd000
ACPI: FADT (v001 ASUS   P2-99    22616.11825) @ 0x07ffd080
ACPI: BOOT (v001 ASUS   P2-99    22616.11825) @ 0x07ffd040
ACPI: DSDT (v001   ASUS P2-99    00000.04096) @ 0x00000000
ACPI: BIOS passes blacklist
ACPI: Subsystem revision 20030522
 tbxface-0117 [03] acpi_load_tables      : ACPI Tables successfully acquired
ACPI Namespace successfully loaded at root c030aa7c
evxfevnt-0093 [04] acpi_enable           : Transition to ACPI mode
successful
ACPI: Interpreter enabled
ACPI: Using PIC for interrupt routing
ACPI: System [ACPI] (supports S0 S1 S5)
ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 5 6 7 9 10 *11 12 14 15)
ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 5 6 *7 9 10 11 12 14 15)
ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 5 6 7 9 10 11 12 14 15, disabled)
ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 6 7 *9 10 11 12 14 15)
ACPI: PCI Root Bridge [PCI0] (00:00)
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT]
ACPI: PCI Interrupt Link [LNKC] enabled at IRQ 10
PCI: Using ACPI for IRQ routing
PCI: if you experience problems, try using option 'pci=noacpi' or even
'acpi=off
'
apm: overridden by ACPI.
ACPI: Power Button (FF) [PWRF]

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