pulseaudio fails to start with kernel 4.11, caused by new snd_hdmi_lpe_audio module)

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On Tue, 21 Mar 2017 00:09:22 +0100,
Pierre-Louis Bossart wrote:
> 
> On 3/20/17 4:52 AM, Takashi Iwai wrote:
> > On Mon, 20 Mar 2017 12:42:58 +0100,
> > Hans de Goede wrote:
> >>
> >> Hi,
> >>
> >> Lately I've been working on fixing various issues people
> >> are having with baytrail / cherrytrail devices. One thing
> >> I noticed when moving my testing / development to 4.11 is
> >> that pulseaudio does not work (it aborts while starting)
> >> this seemed to be caused by the new snd_hdmi_lpe_audio
> >> module. If I blacklist that all is fine. Any idea what
> >> is causing this ?
> >
> > I noticed it once, too, but I had no time to check further.
> > More interestingly, PA works fine when LPE audio is the single driver
> > (i.e. blacklist Intel SST instead), too.  So it's more likely a bug in
> > PA.
> >
> > What happens when you modprobe LPE audio driver after starting the
> > session?  If it kills PA, we can debug more easily :)
> 
> I've seen this as well, I could get either one of the two but not
> both, could this be due to the fact that one set of mixers is
> configured with UCM and the other driver isn't configured by UCM?

No idea, and I had still no time to check (still processing the
pile of pending mails and other bugs :).  Let me add PA guys to Cc.


thanks,

Takashi


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