kernel 2.6.31 incorectly work with nmi_watchdog=0 in startup option

[max]

Binary package hint: linux-image-2.6.31-3-ia64

this bug have influence on Virtualbox.

system create NMI records in /proc/interrupts even in boot command line present nmi_watchdog=0.

dmesg | grep watchdog
[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-2.6.31-3-generic root=UUID=b086dc0d-0fe7-4487-855b-494761765ca7 ro quiet acpi_osi=Linux nosplash nmi_watchdog=0
[ 0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-2.6.31-3-generic root=UUID=b086dc0d-0fe7-4487-855b-494761765ca7 ro quiet acpi_osi=Linux nosplash nmi_watchdog=0
[ 14.459621] vboxdrv: Trying to deactivate the NMI watchdog permanently...
[ 14.459625] vboxdrv: NMI watchdog either active or at least initialized. Please disable the NMI
[ 14.459626] vboxdrv: watchdog by specifying 'nmi_watchdog=0' at kernel command line.

checking NMI could be done (in linux) by command:

    cat /proc/interrupts | grep NMI

in my case results:

    NMI: 0 0 Non-maskable interrupts

All 0 mean that NMI was initialized (because it present) but it is inactive.

In same time some programs (Virtualbox) check only presence line NMI and don't look on values.
Probably some other programs do same.

Could you like to fix it?

ProblemType: Bug
Architecture: amd64
Date: Thu Jul 16 09:12:49 2009
DistroRelease: Ubuntu 9.10
HibernationDevice: RESUME=UUID=341c7f20-921d-42d8-a665-69f98a4c5648
MachineType: LENOVO 2241CTO
Package: linux-image-2.6.31-3-generic 2.6.31-3.19
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.31-3-generic root=UUID=b086dc0d-0fe7-4487-855b-494761765ca7 ro quiet acpi_osi=Linux nosplash nmi_watchdog=0
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-3.19-generic
RelatedPackageVersions: linux-backports-modules-2.6.31-3-generic N/A
SourcePackage: linux
Uname: Linux 2.6.31-3-generic x86_64
dmi.bios.date: 10/30/2008
dmi.bios.vendor: LENOVO
dmi.bios.version: 6FET50WW (1.20 )
dmi.board.name: 2241CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr6FET50WW(1.20):bd10/30/2008:svnLENOVO:pn2241CTO:pvrThinkPadT500:rvnLENOVO:rn2241CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2241CTO
dmi.product.version: ThinkPad T500
dmi.sys.vendor: LENOVO

[max (mikhmv)]

Related Bugs Reports:
Bug #399732
http://www.virtualbox.org/ticket/4529