On Mar 11 14:41:32, g...@oat.com wrote:
> I have 2 USB DACs. One uses a Burr-Brown chip and the other
> one is a Modi 3+ (custom circuit) from Schiit Audio.
> Both work under Linux.
> The Schiit seems to accept playback data but no analog output appears.
> Both are claimed by uaudio(4).
>
> Note the lack of a outputs.dac= line for the unhappy unit.
> There are quite a few differences in the USB interface information
> especially V1 vs V2 format.
>
> Is this problem discussed in an online thread somewhere or would
> tech@ be interested? I'm not familiar with the details of USB audio (yet).
> Would defining UAUDIO_DEBUG help?
>
> Attaching:
> uaudio0 at uhub3 port 3 configuration 1 interface 1
> "Schiit Audio Schiit Modi 3+" rev 2.00/1.00 addr 5
> uaudio0: class v2, high-speed, async, channels: 2 play, 0 rec, 1 ctls
> audio1 at uaudio0
>
> uaudio1 at uhub3 port 4 configuration 1 interface 1
> "Burr-Brown from TI USB Audio CODEC" rev 1.10/1.00 addr 6
> uaudio1: class v1, full-speed, sync, channels: 2 play, 2 rec, 3 ctls
> audio2 at uaudio1
> uhidev3 at uhub3 port 4 configuration 1 interface 3
> "Burr-Brown from TI USB Audio CODEC" rev 1.10/1.00 addr 6
> uhidev3: iclass 3/0
> ucc0 at uhidev3: 3 usages, 3 keys, enum
> wskbd2 at ucc0 mux 1
> wskbd2: connecting to wsdisplay0
How exactly are you running sndiod?
(Does it even know to use these devices?)
How exactly are you playing audio,
i.e. what is the command line?
Jan
> mixerctl -f /dev/audioctl1
> <--------------------------|
> outputs.dac_mute=off |
> record.enable=sysctl |
> |
> mixerctl -f /dev/audioctl2 |
> outputs.dac=255,255 <--------|
> outputs.dac_mute=off
> record.enable=sysctl
>
> Linux usbdevs output:
>
> T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 3 Spd=12 MxCh= 0
> D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
> P: Vendor=08bb ProdID=2902 Rev=01.00
> S: Manufacturer=Burr-Brown from TI
> S: Product=USB Audio CODEC
> C: #Ifs= 4 Cfg#= 1 Atr=80 MxPwr=100mA
> I: If#= 0 Alt= 0 #EPs= 0 Cls=01(audio) Sub=01 Prot=00 Driver=snd-usb-audio
> I: If#= 1 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
> E: Ad=02(O) Atr=09(Isoc) MxPS= 192 Ivl=1ms
> I: If#= 2 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=snd-usb-audio
> E: Ad=84(I) Atr=05(Isoc) MxPS= 196 Ivl=1ms
> I: If#= 3 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=usbhid
> E: Ad=85(I) Atr=03(Int.) MxPS= 1 Ivl=10ms
>
> T: Bus=03 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 7 Spd=480 MxCh= 0
> D: Ver= 2.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs= 1
> P: Vendor=30be ProdID=1014 Rev=01.00
> S: Manufacturer=Schiit Audio
> S: Product=Schiit Modi 3+
> C: #Ifs= 2 Cfg#= 1 Atr=80 MxPwr=500mA
> I: If#= 0 Alt= 0 #EPs= 0 Cls=01(audio) Sub=01 Prot=20 Driver=snd-usb-audio
> I: If#= 1 Alt= 3 #EPs= 2 Cls=01(audio) Sub=02 Prot=20 Driver=snd-usb-audio
> E: Ad=01(O) Atr=05(Isoc) MxPS=1024 Ivl=125us
> E: Ad=81(I) Atr=11(Isoc) MxPS= 4 Ivl=1ms
>
>
