[pulseaudio-tickets] [Bug 49056] New: Pulseaudio does not detect external USB iO4 4-channel input source

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49056

             Bug #: 49056
           Summary: Pulseaudio does not detect external USB iO4 4-channel
                    input source
    Classification: Unclassified
           Product: PulseAudio
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: misc
        AssignedTo: pulseaudio-bugs at lists.freedesktop.org
        ReportedBy: phillip.berndt at googlemail.com
         QAContact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net


The iO4 USB sound card from Alesis can be set to have two stereo output and two
stereo input channels. Pulseaudio does not capture this correctly:

<<<snip<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

$ cat /proc/asound/cards
 2 [iO4            ]: USB-Audio - iO4
                      Alesis iO4 at usb-0000:00:12.0-2, full speed
$ cat /proc/asound/devices| grep "[ 2"
  9: [ 2- 0]: raw midi
 10: [ 2- 0]: digital audio playback
 11: [ 2- 0]: digital audio capture
 12: [ 2]   : control

>>snap>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

The capture and playback both have 4 channels, which I can use from all apps
directly supporting ALSA (like e.g. audacity). But Pulseaudio gets it wrong:

<<<snip<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

$ pactl list # (Stripped everything not iO4 related)

Module #37
        Name: module-alsa-card
        Argument: device_id="2" name="usb-Alesis_iO4-00-iO4"
card_name="alsa_card.usb-Alesis_iO4-00-iO4" namereg_fail=false tsched=yes
ignore_dB=no deferred_volume=yes
card_properties="module-udev-detect.discovered=1"
        Usage counter: 0
        Properties:
                module.author = "Lennart Poettering"
                module.description = "ALSA Card"
                module.version = "1.0"

Card #9
        Name: alsa_card.usb-Alesis_iO4-00-iO4
        Driver: module-alsa-card.c
        Owner Module: 37
        Properties:
                alsa.card = "2"
                alsa.card_name = "iO4"
                alsa.long_card_name = "Alesis iO4 at usb-0000:00:12.0-2, full
speed"
                alsa.driver_name = "snd_usb_audio"
                device.bus_path = "pci-0000:00:12.0-usb-0:2:1.0"
                sysfs.path =
"/devices/pci0000:00/0000:00:12.0/usb4/4-2/4-2:1.0/sound/card2"
                udev.id = "usb-Alesis_iO4-00-iO4"
                device.bus = "usb"
                device.vendor.id = "13b2"
                device.vendor.name = "Alesis"
                device.product.id = "0071"
                device.product.name = "iO4"
                device.serial = "Alesis_iO4"
                device.string = "2"
                device.description = "iO4"
                module-udev-detect.discovered = "1"
                device.icon_name = "audio-card-usb"
        Profiles:
                output:analog-surround-40: Analog Surround 4.0 Output (sinks:
1, sources: 0, priority. 700)
                off: Off (sinks: 0, sources: 0, priority. 0)
        Active Profile: output:analog-surround-40



>>snap>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

It misses the capture device. I guess this is the case because of the uncommon
4-channel input. Pulseaudio should at least offer a profile where the source is
also available. Let me know if there is anything I can do to help debugging
this.

Ideally, it should also offer another one where the channels 1-2 / 3-4 are
split, such that there are two sinks and two sources available. This would fit
the iO4's design. I guess when the input is recognized the splitting can also
be archived via the config files, but it would be far more user friendly to be
able to do this from pavucontrol.

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