[pulseaudio-tickets] [Bug 74324] New: Creative USB Sound Blaster X-Fi HD: No sound on SPDIF output

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=74324

          Priority: medium
            Bug ID: 74324
                CC: lennart at poettering.net
          Assignee: pulseaudio-bugs at lists.freedesktop.org
           Summary: Creative USB Sound Blaster X-Fi HD: No sound on SPDIF
                    output
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: freedesktop at ml.shredzone.de
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: misc
           Product: PulseAudio

When connecting a Creative Sound Blaster X-Fi HD via USB, it is correctly
detected and the analog outputs (headphone jack) and volume knob can be used
out of the box.

However, the SPDIF output is muted. My amplifier detects a signal on the
optical input, but no sound is played. I was unable to configure pavucontrol in
order to have sound on the SPDIF output.

After searching the web, I found a solution [1], added this line to
/etc/pulse/system.pa and restarted PulseAudio:

  load-module module-alsa-sink device=hw:0,1 

Now a second output device called "USB Sound Blaster HD" appears, and when I
select it, the SPDIF output works fine. However, there are no "Advanced"
settings where I could select AC3 and DTS.


Actual behaviour:
1. /etc/pulse/system.pa must be modified to use the SPDIF output
2. In the "Configuration" tab of pavucontrol, only one "USB Sound Blaster HD"
appears. Even when I choose the IEC958 output there, the SPDIF output remains
silent.
3. In the "Output Devices" tab of pavucontrol, there are two "USB Sound Blaster
HD" entries. The first one controls the SPDIF output, but does not allow to
change the "Advanced" settings. The second one belongs to the device shown in
the Configuration tab and only controls the analog outputs. I am unable to use
the SPDIF output there.


Expected behavior:
1. Plug in the USB Sound Blaster (without needing to modify any configuration
files)
2. Choose the IEC958 output in the "Configuration" tab of pavucontrol
3. Configure the IEC958 output in the "Output Devices" tab (e.g. add AC3 and
DTS, control the output volume)
4. Have sound on the SPDIF output


I don't have much experience with ALSA and PulseAudio. However I hope that I
was able explain the issue properly.

Tried on a fresh Fedora 20 x86_64 installation.

[1] http://permalink.gmane.org/gmane.linux.alsa.user/36028

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