linux-kernel - snd_hda_intel 2.6.24-rc2 bug: interrupts don't always work on Lenovo X60s

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Message-ID: <ada1wb05p6n.fsf@cisco.com>
Date:	Thu, 08 Nov 2007 14:48:32 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	linux-kernel@...r.kernel.org, Takashi Iwai <tiwai@...e.de>
Subject: snd_hda_intel 2.6.24-rc2 bug: interrupts don't always work on Lenovo X60s

With 2.6.24-rc2 on my Lenovo X60s, I sometimes get:

    hda_intel: No response from codec, disabling MSI: last cmd=0x002f0d00
    hda_intel: azx_get_response timeout, switching to polling mode: last cmd=0x002f0d00

when loading snd_hda_intel.  Sound still works but interrupts aren't generated.

I tried bisecting but I haven't gotten good info yet because it seems
that this is not completely reproducible -- sometimes when I load the
module, it works fine, and other times I get the message.

I think this is a regression, since I don't recall ever seeing the
message with 2.6.22 or so.

Any idea on how to help debug this?

Thanks,
  Roland
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