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    SubjectRe: 2.6.18: hda_intel: azx_get_response timeout, switching to single_cmd mode...
    At Tue, 26 Sep 2006 08:56:11 -0700,
    Randy Dunlap wrote:
    >
    > On Tue, 26 Sep 2006 17:48:33 +0200 Takashi Iwai wrote:
    >
    > > At Tue, 26 Sep 2006 08:37:20 -0700,
    > > Randy Dunlap wrote:
    > > >
    > > > On Tue, 26 Sep 2006 12:16:33 +0200 Takashi Iwai wrote:
    > > >
    > > > > At Mon, 25 Sep 2006 12:58:08 -0700,
    > > > > Jeremy Fitzhardinge wrote:
    > > > > >
    > > > > > I have a ThinkPad X60 which uses the Intel 82801G HDA audio chip. This
    > > > > > used to work for me, but lately (sometime during 2.6.18-rcX series) it
    > > > > > stopped working - programs trying to use it tend to just block forever
    > > > > > waiting for /dev/dsp.
    > > > > >
    > > > > > The only obvious symptom is:
    > > > > >
    > > > > > hda_intel: azx_get_response timeout, switching to single_cmd mode...
    > > > > >
    > > > > > appearing in the kernel log when booting.
    > > > > >
    > > > >
    > > > > There is no big change relevant to TP X60 during 2.6.18rc, so I don't
    > > > > think it's a regression in the hd-audio driver code.
    > > > >
    > > > > > Details attached. The dmesg output is for the FC6 distro kernel
    > > > > > 2.6.18-1.2689.fc6PAE, but I see the same symptoms with 2.6.18-mm1.
    > > > >
    > > > > You must see difference with mm1 (suppose that mm1 already includes
    > > > > the latest ALSA patches). When the CORB/RIRB interrupt gets broken,
    > > > > the driver first switches to poling mode, then single_cmd mode as
    > > > > fallback.
    > > > >
    > > > > Also, try disable_msi=1 option for mm1. MSI seems broken on some
    > > > > systems.
    > > >
    > > > is that "pci=nomsi" ?
    > >
    > > No, snd-hda-intel driver has a new module option "disable_msi" to
    > > disable MSI support on that driver. As default, it's off, i.e. MSI is
    > > enabled if available. (Well, I feel it's better to rename it
    > > enable_msi and set on as default...)
    > >
    > > Sorry for unclear text.
    >
    > ugh. We shouldn't have drivers with such options IMO.
    > I have seen/used MSI for ethernet, SATA, and audio.

    Heh, you're a lucky guy :)

    > It either works for all of them or none of them AFAIK.
    >
    > Why do you think that it should not just be a global system option/flag?

    In the ealier version, we didn't call pci_enable_msi() in the driver
    while the newer version does unless you pass disable_msi=1 option.
    Thus, this option means to behave like the old driver. This makes
    much easier to find out a regression than a global boot option
    affecting all subsytems.


    Takashi
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