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I've been using an AKG Perception 120 USB on Ubuntu 17.04 and 16.04. Two weeks ago I installed a fresh version of Ubuntu 18.04. Ever since the USB mic is not working. It is not listed in the audio-settings, neither is it detected by alsa.

Here is the output of dmesg after I pull the USB out and put it in again:

[10035.386439] usb 2-1.5.1: new full-speed USB device number 16 using ehci-pci
[10035.501225] usb 2-1.5.1: New USB device found, idVendor=074d, idProduct=3556
[10035.501231] usb 2-1.5.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[10035.501234] usb 2-1.5.1: Product: AKG Perception 120 USB
[10035.501237] usb 2-1.5.1: Manufacturer: AKG Acoustics
[10035.505468] usb 2-1.5.1: current rate 0 is different from the runtime rate 48000
[10035.506216] usb 2-1.5.1: current rate 0 is different from the runtime rate 48000
[10035.856885] usb 2-1.5.1: current rate 44100 is different from the runtime rate 48000
[10035.921624] retire_capture_urb: 6 callbacks suppressed
[10035.930492] usb 2-1.5.1: USB disconnect, device number 16

I'd appreciate any hints. Thanks a lot!

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  • "USB disconnect" means that the device chose to disconnect. Apparently, its firmware cannot handle what Linux tries to do. I am not aware of any relevant changes in the USB audio driver; this is probably PulseAudio doing something different. (According to some reviews, it does not work very well in Windows 10, and does not handle sample rate switching correctly.) – CL. Jun 3 '18 at 20:22
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There was an issue with the USB cable connecting the Microphone to my machine.

AKG Perception 120's seems to still work fine under Ubuntu 18.04.

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