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    SubjectRe: 2.6.19-rc1: known regressions (v2)
    Am Samstag 07 Oktober 2006 23:46 schrieb Adrian Bunk:
    > Subject : snd-hda-intel <-> forcedeth MSI problem
    > References :
    > Submitter : Prakash Punnoor <>
    > Status : unknown

    AFAIK, strictly speaking this is not a regression, but rather a new feature
    breaking: MSI capability of snd-hda-intel. Alsa dev
    Takashi Iwai doesn't think it is snd-hda-intel doing something wrong, but
    rather an IRQ routing probem. As such I am not sure who to cc....

    While I don't really understand the details, I guess it is due to snd and net
    sharing the interrupt in "pure" APIC more:

    23: 232796 0 IO-APIC-fasteoi HDA Intel, eth0

    So both are physically on the same INT line? But MSI of snd want to assign
    another IRQ to itself:

    23: 7486 0 IO-APIC-fasteoi eth0
    316: 0 0 PCI-MSI-edge HDA Intel

    So it seems that irq23 still receives signals from snd and thus the nobody
    cared message gets printed.

    Thus my work-around is simply to disable MSI of snd by
    snd-hda-intel.disable_msi=1 and all is well again.

    So if this cannot be fixed for 2.6.19, I humbly suggest deactivating MSI of
    snd-intel-hda by default.

    (°= =°)
    //\ Prakash Punnoor /\\
    V_/ \_V
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     \ /
      Last update: 2006-10-08 01:05    [W:0.020 / U:65.984 seconds]
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