On Sat, Apr 14, 2018 at 11:55:23AM +0200, Alexandre Ratchov wrote:
> On Tue, Apr 10, 2018 at 03:20:33PM +0200, Robert Klein wrote:
> > Hi Daniel,
> > 
> > On Wed, 4 Apr 2018 03:22:04 -0300
> > Daniel Bolgheroni <[email protected]> wrote:
> > 
> > > Hi,
> > > 
> > > audio is stuttering on media playback when run through sndiod. It's OK
> > > without it.
> > 
> > Maybe related.  Yesterday I disabled webcam and microphone in BIOS on
> > my X250.  Then Video playback (audio and video) was stuttering. I
> > didn't investigate further, as: reverting BIOS settings made it Ok
> > again.
> 
> Thanks. Few notes for the mailing-list archives:
> 
> Certains laptops have a "disable microphone" knob in the BIOS which
> makes the device operate play-only, but it still reports full-duplex
> capability. This confuses any full-duplex program, including sndiod,
> and makes sound stutter. I've found no way to detect this situation.
> 
> Until we manage to properly detect it in the azalia driver, I'd
> suggest not using the BIOS knob (ie keep your microphone enabled). To
> disable it, run as root:
> 
>       chmod 600 /dev/audio[0-9]

As noted by florian@, the proper mode is 0622 (write-only, i.e.
play-only). thanks.

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