the dmesg about disconnect is manual disconnection of usb DAC [ 5937.978117] usb 1-1.4.2: USB disconnect, device number 16
After fresh boot, if I plug-in the DAC the dmesg shows [ 155.552404] usb 1-1.4.1: new full-speed USB device number 10 using xhci_hcd [ 155.941031] usb 1-1.4.1: New USB device found, idVendor=2912, idProduct=120b, bcdDevice= 1.0c [ 155.941035] usb 1-1.4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 155.941037] usb 1-1.4.1: Product: Audioengine D3 [ 155.941038] usb 1-1.4.1: Manufacturer: Audioengine [ 155.941040] usb 1-1.4.1: SerialNumber: Audioengine [ 156.503248] usb 1-1.4.1: 1:1: cannot get freq at ep 0x1 [ 156.526074] usbcore: registered new interface driver snd-usb-audio [ 156.575999] usb 1-1.4.1: 1:1: cannot get freq at ep 0x1 [ 156.605461] usb 1-1.4.1: 1:1: cannot get freq at ep 0x1 I will try to get my hands on another system running 18.04. But my ties to upgrade the kernel up to 4.20.2 resulted in no chance. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1811999 Title: [USB-Audio - Audioengine D3, playback] fails after a while (a second) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1811999/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
