MP-BIOS bug: 8254 timer not conected to IO-APIC

[Stian1979]

I there annyone that know how to solve this?
I found some old posts about it, but nothing that solve the problem.

I tryed to seartch for the problem on the web and it seams to be a problem with some BIOS.
I tryed the latest bios upgrade for my computer, but it did not work.

Seams that only problems ocouring in the windows world is solved.
Anny think I can do about it in software and dos it really mather?

What is it actualy doing?

[mwette]

try booting with "acpi=noirq"

what computer (board) do you have?
also, I'm curious what /proc/interrupts says (before and after, if you do it, adding above)

[Stian1979]

I have a asus computer.

The computer boot without anny problem but this error mesage.
I heard that some bios upgrades can fix the problem, but it did not fix it for me so I gues asus did not know and did not care about a bug that truble linux.

What will "acpi=noirq" do?
What is this timer doing?

CPU0
0: 2913133 <NULL>-edge timer
1: 2348 IO-APIC-edge i8042
7: 0 IO-APIC-edge parport0
8: 0 IO-APIC-edge rtc
12: 345472 IO-APIC-edge i8042
14: 22621 IO-APIC-edge ide0
15: 41171 IO-APIC-edge ide1
16: 21783 IO-APIC-fasteoi HDA Intel
17: 0 IO-APIC-fasteoi yenta
18: 168056 IO-APIC-fasteoi ohci1394, fglrx
19: 48 IO-APIC-fasteoi ohci_hcd:usb1, ohci_hcd:usb2, ehci_hcd:usb3, sdhci:slot0
21: 26414 IO-APIC-fasteoi acpi
2301: 22189 PCI-MSI-edge eth0
NMI: 0
LOC: 2912998
ERR: 21

[mwette]

Originally Posted by Stian1979

I have a asus computer.

The computer boot without anny problem but this error mesage.
I heard that some bios upgrades can fix the problem, but it did not fix it for me so I gues asus did not know and did not care about a bug that truble linux.

What will "acpi=noirq" do?
What is this timer doing?

Linux is a timesharing kernel. It slices time into bits of 1-10 msec (and feeds slots)
to different processes. The timer interrupt signal needs to be routed to the CPU.
This gets done during initialization. The kernel will get interrrupt routing information
from the ACPI tables, from the MP-table or from standard conventional routing. If
you use the boot argument acpi=off, then the kernel will bypass the ACPI tables and
use the MP-table. At least that is my understanding. If you want to know more search
google for "linux acpi" or intel_MP_spec. The latter term will lead to the 1.4 spec which
explains alot about how multi-CPU systems are laid out. Good reading ... The ACPI spec,
on the otherhand is, to me at least, a nightmare.

[Stian1979]

so acpi=noirq will improve the performance off my system or will it make no diference?

Where do I put the comand?

I send a e-mail about it to asus. I make shure I send then a e-mail for every linux problem I encounter. Not because I think it will help me in anny way, but mainly just to be a a-hole to them since they are ignoring linux. Complained that there latest bios version did not solve my problems.

[tdarsey]

I am having the same kind of trouble. Were do I enter "acpi=noirq" if I cant get it to boot?