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    SubjectRe: IO-APIC -- lockup on machine if enabled
    Dave Jones <> writes:
    >On Wed, Mar 13, 2002 at 08:34:22AM -0500, Josh Fryman wrote:
    > > i have a new laptop (Dell Latitude C610) running 2.4.18-rc4. when i built the
    > > new kernel, i thought i would amuse myself by turning on IO-APIC.

    > "Don't do that" 8-)

    Unfortunately, at least on my C800 here, not using it breaks IEEE1394:

    kernel: ohci1394_0: Waking dma ctx=2 ... processing is probably too slow

    and communication breaks down shortly after (have to unload/reload the
    modules to make it work again). On the other hand, with IO-APIC + Local
    APIC enabled (APM and ACPI disabled) firewire works fine.

    I note that W2K on the same machine appears to have no trouble using
    both IEEE1394 and power management together. (I have booted W2K less
    than ten times though versus half a year of linux use, so this may be
    a false impression.)


    Jonathan H N Chin, 1 dan | deputy computer | Newton Institute, Cambridge, UK
    <> | systems mangler | tel/fax: +44 1223 335986/330508

    "respondeo etsi mutabor" --Rosenstock-Huessy
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