Disabling IRQ #2

[Kimia <kimiazhu gmail com>]

when i update my fedora core 6 with some software(not the kernel, i update my kernel once to the 2.6.18-1.2849,and now it is this version),then this occured. from then on, everytimes i installed software or update my system, the console will be distorted,and i restart the computer, open the console , then the console aoto print the message:

Message from syslogd localhost at Mon Dec 18 13:26:31 2006 ...
localhost kernel: Disabling IRQ #2

i force to stop ACPI in Services Setting menu.
i want to fix the problem without stop ACPI, what should i do?
any opinion will be appreciated.
thanx!

-- 
Kimia