User-Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.97 Safari/537.36 Build Identifier: I have an ASUS Xonar SE card which has an iec958 device (optical/TOSLINK). I try to send sound to the device with: aplay -vv -D iec958:CARD=SoundCard,DEV=0 /path/to/wav/file I can see the VU meter bouncing up and down, but no sound is produced and the optical cable is not lit (I have tried another cable with the same result). The device shows as recognized and on: $ amixer -c0 contents [...] numid=19,iface=CARD,name='IEC958 In - Output Jack' ; type=BOOLEAN,access=r-------,values=1 : values=on The referenced URL points to a thread from the Fedora Users list where someone far more knowledgeable than me regarding ALSA helped determine that this is probably a bug. The device driver shows the device should work, but it doesn't. The card in question is one that has a USB bus chip on it plus a USB audio chip: $ lspci [...] 01:00.0 USB controller: ASMedia Technology Inc. ASM1042A USB 3.0 Host Controller $ lsusb [...] Bus 003 Device 002: ID 0b05:189d ASUSTek Computer, Inc. Xonar SoundCard The referenced Fedora Users list thread contains all of the ALSA-related commands that were run to diagnose and test this. Reproducible: Always Steps to Reproduce: 1.Attempt to play a sound file through the IEC958 device on the ASUS Xonar SE sound card 2. 3. Actual Results: No sound is produced and the optical cable is not lit, although the device shows as present and active, and the VU meter shows that the application is sending sound. Expected Results: Sound should be produced, optical cable should be lit.
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