linux-kernel - Re: [SOUND] SBx00 sound card using snd_hda_codec

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Date:	Fri, 11 Feb 2011 14:25:03 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Wang Lei <f3d27b@...il.com>
Cc:	linux-kernel@...r.kernel.org, Jaroslav Kysela <perex@...ex.cz>
Subject: Re: [SOUND] SBx00 sound card using snd_hda_codec_analog auto mutes

At Fri, 11 Feb 2011 20:58:49 +0800,
Wang Lei wrote:
> 
> Takashi Iwai <tiwai@...e.de> writes:
> 
> > At Fri, 11 Feb 2011 20:23:21 +0800,
> > Wang Lei wrote:
> >> 
> >> Thanks for your reply!
> >> 
> >> Takashi Iwai <tiwai@...e.de> writes:
> >> 
> >> > At Thu, 10 Feb 2011 20:49:51 +0800,
> >> > Wang Lei wrote:
> >> >> 
> >> >> On my laptop, the sound card auto mutes some seconds after i enable it.
> >> >> And play a audio file can't make sound. This is not a powersave feature,
> >> >> because i haven't enable it. I guess it's a driver problem. It occurs
> >> >> since 2.6.36.X. Please help.
> >> >
> >> > Then a possible cause would be the badly working interrupts.
> >> > Or, I remember vaguely some reports mentioning conflicts with radeon
> >> > driver.
> >> >
> >> > Anyway, try to reproduce without the graphic interface first.
> >> >
> >> 
> >> I have reproduced it without the graphic interface.
> >> 
> >> > Also, try to pass enable_msi=0 or 1.  AMD controllers tend to unstable
> >> > regarding MSI.
> >> >
> >> 
> >> And pass enable_msi=0 or 1 to snd_hda_intel, or even add boot parameter
> >> pci=nomsi (i actually don't know whether this is reasonable), the
> >> problem occurs.
> >> 
> >> I have forgot to mention this, when passing apci=off to the boot kernel,
> >> there is no this problem.
> >
> > Then check whether the interrupt is properly generated during PCM
> > playback by watching /proc/interrupts.  If not, it's likely an ACPI or
> > BIOS problem.
> >
> 
> I hope i did the right thing. I `cat /proc/interrupts > 1', then use
> alsamixer increase the PCM channel, then `cat /proc/interrupts >2'.

It's not about the mixer operation.  Check whether the interrupts of
the audio driver (in your case irq 16) increase during PCM playback.


Takashi
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