linux-kernel - Re: [BUG] GPF in snd_hda

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Date:	Tue, 13 Oct 2009 08:12:50 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Luca Tettamanti <kronos.it@...il.com>
Cc:	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [BUG] GPF in snd_hda_intel

At Mon, 12 Oct 2009 21:39:21 +0200,
Luca Tettamanti wrote:
> 
> On Mon, Oct 12, 2009 at 7:58 AM, Takashi Iwai <tiwai@...e.de> wrote:
> > At Sat, 10 Oct 2009 15:01:10 +0200,
> > Luca Tettamanti wrote:
> >>
> >> Hello,
> >> with current git kernel (bd381934) I see a GPF when the snd_hda_intel driver is
> >> loaded; the regression is recent, 0eca52a works fine.
> >> The machine is an ASUS laptop (F3Sa), this is the sound card:
> >
> > Could you load the snd-hda-intel module with probe_only=1 option,
> > and give the output of "alsa-info.sh --no-upload" ?
> >
> > If 0eca52a worked, there are only a few changes regarding hda-intel.
> >
> > f8f25ba3563dab14b1c3ea4d829642b8a61ca5d7
> >    ALSA: hda - Add a workaround for ASUS A7K
> 
> This is probably related; I haven't actually tested yet, but I have
> one more information: I had "model=lenovo" in modprobe configuration.

Ah, this is it.  I can reproduce the problem with my emulator now.
The patch below fixes the issue.

> This was necessary because otherwise the driver applied the quirk for
> Asus G1, resulting in no sound (see bug
> https://bugtrack.alsa-project.org/alsa-bug/view.php?id=3513).
> The driver works fine without "model" parameter (possibly due to the
> removal of the quirk entry for the the G1); I get a warning about a
> timeout when MSI is not enabled though:
> 
> HDA Intel 0000:00:1b.0: PCI INT A disabled
> HDA Intel 0000:00:1b.0: PCI INT A -> GSI 22 (level, low) -> IRQ 22
> HDA Intel 0000:00:1b.0: setting latency timer to 64
> hda_codec: ALC660-VD: BIOS auto-probing.
> input: HDA Digital PCBeep as /devices/pci0000:00/0000:00:1b.0/input/input9
> hda-intel: azx_get_response timeout, switching to polling mode: last
> cmd=0x018f0900

It's no critical error, but if enable_msi=1 helps, just keep the option.
In 2.6.33, MSI will be enabled as default.


thanks,

Takashi

---
>From 2d9c648295d7bc376305337d29f540a5e411f632 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@...e.de>
Date: Tue, 13 Oct 2009 08:06:55 +0200
Subject: [PATCH] ALSA: hda - Fix overflow of spec->init_verbs in patch_realtek.c

ALC861-VD lenovo model causes overflow of spec->init_verbs entries due to
the recent changes.  Simply increase the array size to avoid the overflow.

Reported-by: Luca Tettamanti <kronos.it@...il.com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
---
 sound/pci/hda/patch_realtek.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 470fd74..c08ca66 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -275,7 +275,7 @@ struct alc_spec {
 	struct snd_kcontrol_new *cap_mixer;	/* capture mixer */
 	unsigned int beep_amp;	/* beep amp value, set via set_beep_amp() */
 
-	const struct hda_verb *init_verbs[5];	/* initialization verbs
+	const struct hda_verb *init_verbs[10];	/* initialization verbs
 						 * don't forget NULL
 						 * termination!
 						 */
-- 
1.6.4.2

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