USB Soundcard no microphone (input) device

I would also be really grateful for this fix. I too have a Xonar U7 and when opening alsamixer in the terminal, all output devices are listed, along with capture devices; however these capture devices are unavailable and you cannot enable them (it lists two for some reason, see here: http://askubuntu.com/questions/498204/usb-sound-card-input-xonar-u7)

Status changed to 'Confirmed' because the bug affects multiple users.

It might also be worth noting that initially, the Xonar U7 produces a broken pipe error, which is surpressed in order to access the item in alsamixer.

Any good news with not working microphone?

post the output

lsusb -vvvv

it is strange that there is no device zero

have you try device 1 ?

ARECORD

**** List of CAPTURE Hardware Devices ****
card 1: Ed [Xonar U7 Echelon Ed.], device 1: USB Audio [USB Audio #1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Simple mixer control 'PCM',0
  Capabilities: cswitch cswitch-joined
  Capture channels: Mono
  Mono: Capture [on]
Simple mixer control 'PCM Capture Source',0
  Capabilities: enum
  Items: 'Unit 22' 'Unit 22'
  Item0: 'Unit 22'
Simple mixer control 'PCM',1
  Capabilities: cswitch cswitch-joined
  Capture channels: Mono
  Mono: Capture [on]
Simple mixer control 'IEC958 In',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'Input Gain Pad Control',0
  Capabilities: pswitch
  Playback channels: Front Left - Front Right
  Mono:
  Front Left: Playback [on]
  Front Right: Playback [on]

Here's output from
lsusb -vvvv

This is still the case on Kernel 4.1

With kernel 4.3 input is working now. But only lineIn.

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/usb?id=5ee20bc792467d7d612157e0a9962765aa943b08

> With kernel 4.3 input is working now. But only lineIn.

USB Mixer: usb_id=0x104385c1, ctrlif=0, ctlerr=1
Card: ASUS Xonar U7 Echelon Ed. at usb-0000:00:13.2-3, high speed
  Unit: 13
    Control: name="Input Gain Pad Control", index=0
    Info: id=13, control=12, cmask=0x3, channels=2, type="BOOLEAN"
    Volume: min=0, max=1, dBmin=0, dBmax=0
  Unit: 13
    Control: name="Speaker Playback Volume", index=0
    Info: id=13, control=2, cmask=0xff, channels=8, type="S16"
    Volume: min=-32512, max=0, dBmin=-12700, dBmax=0
  Unit: 13
    Control: name="Speaker Playback Switch", index=0
    Info: id=13, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
    Volume: min=0, max=1, dBmin=0, dBmax=0
  Unit: 14
    Control: name="IEC958 In Playback Switch", index=0
    Info: id=14, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
    Volume: min=0, max=1, dBmin=0, dBmax=0
  Unit: 16
    Control: name="PCM Capture Switch", index=0
    Info: id=16, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
    Volume: min=0, max=1, dBmin=0, dBmax=0
  Unit: 17
    Control: name="PCM Capture Switch", index=1
    Info: id=17, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
    Volume: min=0, max=1, dBmin=0, dBmax=0
  Unit: 20
    Control: name="PCM Capture Source", index=0
    Info: id=20, control=0, cmask=0x0, channels=1, type="U8"
    Volume: min=1, max=2, dBmin=0, dBmax=0

http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/src/modules/alsa/mixer/paths?id=b7744e5004b7dbd36bbb0ed7d211e7da3f5feb1b

https://bugzilla.kernel.org/show_bug.cgi?id=104841

As both USB audio devices have three playback devices and the internal order changed

do three playback devices support different format , rates or channels

Card 1: Ed [Xonar U7 Echelon Ed.], device 0: USB Audio [USB Audio]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 1: Ed [Xonar U7 Echelon Ed.], device 1: USB Audio [USB Audio #1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: Ed [Xonar U7 Echelon Ed.], device 2: USB Audio [USB Audio #2]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

ARECORD

**** List of CAPTURE Hardware Devices ****
card 1: Ed [Xonar U7 Echelon Ed.], device 1: USB Audio [USB Audio #1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

I have the same issue and it still isn't working :(

could somebody comment on whether this will be fixed at any point?

I fixed this on my U7 with the info in this post.

https://forums.gentoo.org/viewtopic-t-1025106-start-0.html

----

For posterity in case the form post disappears...

I found my answer here:

https://wiki.archlinux.org/index.php/PulseAudio/Troubleshooting#Microphone_not_detected_by_PulseAudio

The summary:

I edited /etc/pulse/default.pa to add the line:

Code:
load-module module-alsa-source device=hw:2,1

...since "arecord -l" showed that my missing mic was Card 2, Device 1

This newly-added line has to precede the lines:

Code:
### Automatically load driver modules depending on the hardware available
.ifexists module-udev-detect.so
load-module module-udev-detect

...in my case, this wound up being Line 52 of default.pa

I hope this can help someone else!

In #17 doesn't work for me, if I do that I have only a dummy output and no mic in.