linux-kernel - Re: [2.6.33-rc1] [SOUND] HDA: high cpu usage, noise

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Date:	Mon, 21 Dec 2009 20:08:34 +0100
From:	Éric Piel <eric.piel@...mplin-utc.net>
To:	Maciej Rutecki <maciej.rutecki@...il.com>
CC:	Takashi Iwai <tiwai@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	alsa-devel@...a-project.org, perex@...ex.cz,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [2.6.33-rc1] [SOUND] HDA: high cpu usage, noise

Op 21-12-09 19:12, Maciej Rutecki schreef:
> 2009/12/21 Takashi Iwai <tiwai@...e.de>:
>> At Sun, 20 Dec 2009 18:27:45 +0100,
>> Maciej Rutecki wrote:
>>>
>>> Hi
>>>
>>> Affected kernel: 2.6.33-rc1
>>> Last known good: 2.6.32
>>
>> The only fundamental change, AFAIK, is the use of MSI as default.
>> Could you try to add enable_msi=0 option to snd-hda-intel?
>>
> 
> root@...is:/# cat /sys/module/snd_hda_intel/parameters/enable_msi
> 0
> 
> Still the same:
> ps aux:
> 
> root      1117 27.4  0.0      0     0 ?        S    19:00   2:05 [hd-audio0]
> 
> I also notice short sound during booting system, when sound modules is
> loading.  I can try bisection, but in next week; already I don't have
> to much time.
Hello,
I've got the same problem here (high hd-audio0 usage + clicks in the
output sound).

Hardware is identical:
/proc/asound/pcm
00-00: AD198x Analog : AD198x Analog : playback 1 : capture 1

I haven't tried the enable_msi parameter but, just to give more info,
here is the log ("dmesg | grep -i hda") when the bug happens:
Dec 18 10:39:10 dutifh kernel: HDA Intel 0000:00:1b.0: power state
changed by ACPI to D0
Dec 18 10:39:10 dutifh kernel: HDA Intel 0000:00:1b.0: PCI INT A -> GSI
17 (level, low) -> IRQ 17
Dec 18 10:39:10 dutifh kernel: input: HDA Digital PCBeep as
/devices/pci0000:00/0000:00:1b.0/input/input12
Dec 18 10:39:10 dutifh kernel: hda-intel: azx_get_response timeout,
switching to polling mode: last cmd=0x006f0900

And here is with 2.6.32, working fine
Dec 18 11:46:03 dutifh kernel: HDA Intel 0000:00:1b.0: power state
changed by ACPI to D0
Dec 18 11:46:03 dutifh kernel: HDA Intel 0000:00:1b.0: PCI INT A -> GSI
17 (level, low) -> IRQ 17
Dec 18 11:46:03 dutifh kernel: input: HDA Digital PCBeep as
/devices/pci0000:00/0000:00:1b.0/input/input11

Could it be coming from this timeout?

Eric
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