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

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Date:	Tue, 22 Dec 2009 08:04:53 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Éric Piel <eric.piel@...mplin-utc.net>
Cc:	Maciej Rutecki <maciej.rutecki@...il.com>,
	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

At Mon, 21 Dec 2009 20:08:34 +0100,
Éric Piel wrote:
> 
> 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?

It shouldn't.  The polling mode doesn't give any behavioral change,
and the CPU usage can't be that high.

Try is to pass bdl_pos_adj=0 option.  This should reduce the CPU hog,
at least.  But it doesn't mean it's the right fix...

Another thing to try is to replace the whole HD-audio stack with the
last working one (was it 2.6.32?), and check whether it works with
2.6.32 core.


thanks,

Takashi
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