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    SubjectRe: [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@suse.de> writes:
    >
    > > At Fri, 11 Feb 2011 20:23:21 +0800,
    > > Wang Lei wrote:
    > >>
    > >> Thanks for your reply!
    > >>
    > >> Takashi Iwai <tiwai@suse.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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