[Bug 447852] Re: WARNING: at /build/buildd/linux-2.6.31/arch/x86/kernel/apic/apic.c:247 native_apic_write_dummy+0x33/0x40()

[Jerome]

Same as comment #20. Using a K7S5A MB with ACPI enabled. Kernel fais to detect that :
Mar 21 10:03:08 bouzin kernel: [    0.000000] Local APIC disabled by BIOS -- you can enable it with "lapic"
Mar 21 10:03:08 bouzin kernel: [    0.000000] APIC: disable apic facility

Adding lapic to the default boot options makes the warning disappear.

---- WORKAROUND ----
On ubuntu, you need to modify /boot/grub/menu.lst (needs root privileges) :

it's the kopt line (or the defoptions line, if you're unsure what you're doing)
# kopt=root=UUID=a251989a-0f6a-4ac2-b496-3420bb7c23ba ro (the line will differ on your system)

make it (add lapic at the end)
# kopt=root=UUID=a251989a-0f6a-4ac2-b496-3420bb7c23ba ro lapic

Then run update-grub again (needs root privileges). If asked about a conflict between modified local version and developper version, chose developper version to allow grub-update to modify the entries.
------------------------------

I guess it's the kernel's fault. It should detect ACPI properly in the
first place.

-- 
WARNING: at /build/buildd/linux-2.6.31/arch/x86/kernel/apic/apic.c:247 native_apic_write_dummy+0x33/0x40()
https://bugs.launchpad.net/bugs/447852
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