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I'm not sure if this is the right forum to post this, but here goes. I bought a FiiO BTR5 DAC/Amp and I've been getting this terrible disconnect loops every time I switch apps. I'm using it in USB mode on Ubuntu 20.04.1 LTS. Let's say I'm playing a youtube video in firefox, I stop the video and switch to Spotifyd or DeaDBeeF, the DAC disconnects and then tries to reconnect. It goes into a loop while throwing the below messages in `dmesg`


Code:

[ 9171.589745] usb 2-1-port2: unable to enumerate USB device
[ 9171.813671] usb 2-1.2: new full-speed USB device number 43 using ehci-pci
[ 9172.101645] usb 2-1.2: device descriptor read/64, error -32
[ 9172.705676] usb 2-1.2: device descriptor read/64, error -32
[ 9173.309605] usb 2-1.2: new full-speed USB device number 44 using ehci-pci
[ 9173.597922] usb 2-1-port2: attempt power cycle
[ 9174.201557] usb 2-1.2: new full-speed USB device number 45 using ehci-pci
[ 9174.617574] usb 2-1.2: device not accepting address 45, error -32
Some times this goes on for minutes and I have un-plug and re-plug the DAC. Other times it re-connects back in under 10 seconds. The interesting thing is that the DAP doesn't disconnect if I have one app playing audio through the DAC and I start audio in another app. Now I can hear both audio at the same time and can even stop playing audio in one and the other will keep playing without disconnecting.


Code:
[ 6564.157461] usb 2-1.1.1: new full-speed USB device number 18 using ehci-pci         
[ 6564.325570] usb 2-1.1.1: new high-speed USB device number 19 using ehci-pci         
[ 6564.443455] usb 2-1.1.1: New USB device found, idVendor=2972, idProduct=0047, bcdDevice= 0.2e
[ 6564.443462] usb 2-1.1.1: New USB device strings: Mfr=1, Product=3, SerialNumber=0   
[ 6564.443466] usb 2-1.1.1: Product: FiiO BTR5                                                                                                                                 
[ 6564.443469] usb 2-1.1.1: Manufacturer: FiiO                                         
[ 6564.770310] usb 2-1.1.1: 1:3 : unsupported format bits 0x100000000                 
[ 6760.623731] usb 2-1.1.1: USB disconnect, device number 19                           
[ 6760.706304] usb 2-1.1.1: new full-speed USB device number 20 using ehci-pci         
[ 6760.786332] usb 2-1.1.1: device descriptor read/64, error -32                       
[ 6761.182336] usb 2-1.1.1: device descriptor read/64, error -32                       
[ 6761.786338] usb 2-1.1.1: new full-speed USB device number 21 using ehci-pci         
[ 6762.074295] usb 2-1.1.1: device descriptor read/64, error -32                                                                                                               
[ 6762.678316] usb 2-1.1.1: device descriptor read/64, error -32                       
[ 6762.786418] usb 2-1.1-port1: attempt power cycle                                   
[ 6763.618253] usb 2-1.1.1: new high-speed USB device number 22 using ehci-pci         
[ 6763.647973] usb 2-1.1.1: New USB device found, idVendor=2972, idProduct=0047, bcdDevice= 0.2e
[ 6763.647980] usb 2-1.1.1: New USB device strings: Mfr=1, Product=3, SerialNumber=0   
[ 6763.647983] usb 2-1.1.1: Product: FiiO BTR5                                                                                                                                 
[ 6763.647987] usb 2-1.1.1: Manufacturer: FiiO                                         
[ 6763.975484] usb 2-1.1.1: 1:3 : unsupported format bits 0x100000000
`alsamixer` doesn't show volume control for this device. Below is the output from `udevadm monitor` while this happens


Code:
KERNEL[11553.007770] remove  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0/sound/card1/controlC1 (sound)
KERNEL[11553.008238] remove  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0/sound/card1/pcmC1D0p (sound)
UDEV  [11553.008350] remove  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0/sound/card1/controlC1 (sound)
KERNEL[11553.009120] remove  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0/sound/card1 (sound)
UDEV  [11553.009179] remove  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0/sound/card1/pcmC1D0p (sound)
KERNEL[11553.009864] unbind  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0 (usb)
UDEV  [11553.010077] unbind  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.1 (usb)
KERNEL[11553.010222] remove  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0 (usb)
KERNEL[11553.010264] unbind  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.1 (usb)
KERNEL[11553.010312] remove  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.1 (usb)
KERNEL[11553.010353] remove  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.2 (usb)
KERNEL[11553.010395] unbind  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1 (usb)
KERNEL[11553.010435] remove  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1 (usb)
UDEV  [11553.011545] remove  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0/sound/card1 (sound)
UDEV  [11553.016700] remove  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.1 (usb)
UDEV  [11553.017169] remove  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.2 (usb)
UDEV  [11553.025347] unbind  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0 (usb)
UDEV  [11553.029337] remove  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0 (usb)
UDEV  [11553.035394] unbind  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1 (usb)
UDEV  [11553.062888] remove  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1 (usb)
KERNEL[11553.188238] add      /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1 (usb)
KERNEL[11553.189291] add      /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0 (usb)
KERNEL[11553.816529] add      /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0/sound/card1 (sound)
KERNEL[11553.816600] add      /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0/sound/card1/pcmC1D0p (sound)
KERNEL[11553.816669] add      /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0/sound/card1/controlC1 (sound)
KERNEL[11553.816717] bind    /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0 (usb)
KERNEL[11553.816878] add      /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.1 (usb)
KERNEL[11553.816916] bind    /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.1 (usb)
KERNEL[11553.816955] add      /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.2 (usb)
KERNEL[11553.816999] bind    /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1 (usb)
UDEV  [11554.410603] add      /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1 (usb)
UDEV  [11554.425683] add      /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.2 (usb)
UDEV  [11554.429341] add      /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.1 (usb)
UDEV  [11554.430818] add      /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0 (usb)
UDEV  [11554.435822] bind    /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.1 (usb)
UDEV  [11554.439145] add      /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0/sound/card1 (sound)
UDEV  [11554.449477] add      /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0/sound/card1/pcmC1D0p (sound)
KERNEL[11554.452836] change  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0/sound/card1 (sound)
UDEV  [11554.464353] add      /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0/sound/card1/controlC1 (sound)
UDEV  [11554.468822] bind    /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0 (usb)
UDEV  [11554.481093] bind    /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1 (usb)
UDEV  [11554.492521] change  /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1/2-1.1.1/2-1.1.1:1.0/sound/card1 (sound)
Here's the output from `lsusb`

Code:
[~]> lsusb
Bus 002 Device 005: ID 046d:c33b Logitech, Inc.
Bus 002 Device 004: ID 046d:c52f Logitech, Inc. Unifying Receiver
Bus 002 Device 068: ID 2972:0047 
Bus 002 Device 003: ID 0bda:5409 Realtek Semiconductor Corp.
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
[~]> cat /proc/asound/cards
 0 [PCH            ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0xf2520000 irq 33
 1 [BTR5          ]: USB-Audio - FiiO BTR5
                      FiiO FiiO BTR5 at usb-0000:00:1d.0-1.1.1, high speed

The no-name entry is the DAC. I've tried swapping cables and switching ports. Any help is highly appreciated.
08-28-2020, 08:09 AM
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