Date: Wed, 23 May 2012 21:32:48 +0300 From: Alexander Motin <mav@FreeBSD.org> To: Konstantin Belousov <kostikbel@gmail.com> Cc: multimedia@freebsd.org Subject: Re: NV10 hdac issue Message-ID: <4FBD2D50.5080205@FreeBSD.org> In-Reply-To: <20120522220640.GB2358@deviant.kiev.zoral.com.ua> References: <20120522220640.GB2358@deviant.kiev.zoral.com.ua>
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On 05/23/12 01:06, Konstantin Belousov wrote: > I have (another) Atom motherboard from Intel, DN2800MT. Now, the problem > is with distorted sound. Anything is played as if some pause is inserted > after the next sample is finished. So I hear the proper pitch, but with > guggle between fragments. I am not sure how to describe it better, except > to say that it sounds as if buffering was not enough, for regular short > intervals of approx. 0.5 sec. > > I do not believe that 1.8Hhz Atoms are too slow to decode mp3 or to play wav. > > The hda controller is > hdac0@pci0:0:27:0: class=0x040300 card=0x20128086 chip=0x27d88086 rev=0x02 hdr=0x00 > codec is Realtek ALC888. The verbose dmesg from hda_snd load is at > http://people.freebsd.org/~kib/tom.dmesg.txt , assuming this is useful. > > I would want to get normal sound from this board, thanks in advance. I haven't seen alike reports neither for this controller, nor for this CODEC. I would try to experiment with: 1) disabling MSI interrupts with hint.hdac.0.msi=0 2) switching to polling mode without using any interrupts with dev.hdac.0.polling=1 3) changing buffer size with hw.snd.latency 4) changing playback format (or vchans format it it is used) 5) setting sysctl hw.snd.verbose=2 and checking for application level underruns with `cat /dev/sndstat`. -- Alexander Motin
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