Re: Why do so many machines need "noapic"?

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Dave Jones wrote:
If memory serves correctly, that was circa 2.6.10, back in these commits..

commit a068ea13d1db406e15c346e93530343f6e70184c
Author: Len Brown <[email protected]>
Date:   Sun Oct 10 05:21:08 2004 -0400

    [ACPI] If BIOS disabled the LAPIC, believe it by default.
    "lapic" is available to force enabling the LAPIC
    in the event you know more than your BIOS vendor.
    http://bugzilla.kernel.org/show_bug.cgi?id=3238

commit 2fcfece90db9643b6f30a7ad343898a2871e6a81
Author: Len Brown <[email protected]>
Date:   Sat Oct 9 20:12:45 2004 -0400

    [ACPI] Don't enable LAPIC when the BIOS disabled it.
    Doing so apparently breaks every Dell on Earth.
    http://bugzilla.kernel.org/show_bug.cgi?id=3238


But those changes relate to the local APIC, which 'noapic' shouldn't
have any effect on should it ?

If the LAPIC is disabled, then you CAN'T use the IO-APIC right?  So then
wouldn't the noapic option have no effects since the apic is already
disabled?



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