Can't enable input and output of a USB device simultaneously

[Sean M. Pappalardo]

When testing with a USB headset (04f3:0a11 Elan Microelectronics Corp.) at 48kHz (the only one it supports,) I can't enable its microphone input and its headphone output at the same time or I get:

Expression 'alsa_snd_pcm_start( stream->playback.pcm )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 2845
Expression 'AlsaStart( stream, 0 )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4140

...and Mixxx freezes. This is on 1.10 r2926 with PA 19+svn20110326 on Debian Squeeze.

I can, however use one or the other without a problem. (E.g. USB mic, on-board sound output or vice versa.)

[ԜаӀtеr Ⅼарсһуnѕkі (wxl)]

Using a first generation Griffin iMic, I have no such problems.

Mixxx 1.10.0 beta 1
Lubuntu 11.10
ThinkPad R60
Intel Core Duo T2500 2.0GHz
1GB RAM
ALSA, naturally.
And only on 48kHz.

[ԜаӀtеr Ⅼарсһуnѕkі (wxl)]

Reproduction:
0. Load MIxxx
1. Open Options > Sound Hardware > Input > Microphone
2. Select iMic
3. Open Options > Sound Hardware > Output > Master
4. Select iMic
5. Hit Apply
6. Hit OK
7. Load up a file from Library and play it just to be sure
8. Quit Mixxx

[Sean M. Pappalardo (pegasus-renegadetech)]

I also tested with an American Audio VMS4 and had the same problem. I wonder now if it's my system's libraries/version of PA.

[LENHOF Jean-Yves (jean-yves)]

I have a similar problem with a recent Native Instruments Traktor Audio 10 usb sound card.... Not always freezing but more crashing

[Sean M. Pappalardo (pegasus-renegadetech)]

This is a known Linux kernel bug with Intel 5/3400 series USB2 controllers with Full-speed audio devices. It is fixed in kernel 3.2.0-rc3 and Debian is going to apply the fix to the 3.1 kernel.

[Mikołaj Bonowski (xbonio)]

I am still experiencing the bug running Ubuntu 15.10 and 4.2.0-19-generic kernel.
Is there any patch I should apply to fix it?

Here's the hardware I use:

- ESI U46DJ audio interface
- USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)

Terminal output:
Debug [Main]: Starting vinyl control xwax thread
Debug [Main]: SoundDevicePortAudio::open() "2, U46DJ: USB Audio (hw:1,0)"
Debug [Main]: framesPerBuffer: 128
Debug [Main]: Requested sample rate: 44100 Hz, latency: 2.90249 ms
Debug [Main]: Output channels: 2 | Input channels: 4
Debug [Main]: Opening stream with id 2
Debug [Main]: Opened PortAudio stream successfully... starting
Debug [Main]: Dynamically loaded PortAudio library
Expression 'alsa_snd_pcm_start( stream->playback.pcm )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 2925
Expression 'AlsaStart( stream, 0 )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4212

[Smaug (diri3l)]

I still got the same bug running Lubuntu 15.10 / Ubuntu Studio 14.04 / Ubuntu Studio 15.10 on an Asus UX31E Notebook.

[Launchpad Janitor (janitor)]

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

[Swiftb0y (swiftb0y)]

Mixxx now uses GitHub for bug tracking. This bug has been migrated to:
https://github.com/mixxxdj/mixxx/issues/6093