I added this to the a52.conf file located in
/us/share/alsa/alsa.conf.d/a52.conf:
ctl.a52 {
@args [ CARD ]
@args.CARD {
type string
default 0
}
type hw
card $CARD
}
And now I get this from pulseaudio:
I: [pulseaudio] alsa-sink.c: Successfully opened device a52:0.
I: [pulseaudio] alsa-sink.c: Selected mapping 'Digital Surround 5.1
(IEC958/AC3)' (iec958-ac3-surround-51).
I: [pulseaudio] alsa-sink.c: Cannot enable timer-based scheduling, falling back
to sound IRQ scheduling.
I: [pulseaudio] alsa-sink.c: Successfully enabled mmap() mode.
I: [pulseaudio] alsa-util.c: Successfully attached to mixer 'a52:0'
Previously pulseaudio reported this:
I: [pulseaudio] alsa-sink.c: Successfully opened device a52:0.
I: [pulseaudio] alsa-sink.c: Selected mapping 'Digital Surround 5.1
(IEC958/AC3)' (iec958-ac3-surround-51).
I: [pulseaudio] alsa-sink.c: Cannot enable timer-based scheduling, falling back
to sound IRQ scheduling.
I: [pulseaudio] alsa-sink.c: Successfully enabled mmap() mode.
I: [pulseaudio] (alsa-lib)control.c: Invalid CTL a52:0
I: [pulseaudio] alsa-util.c: Unable to attach to mixer a52:0: No such file or
directory
I: [pulseaudio] alsa-sink.c: Failed to find a working mixer device.
This is an improvement that didn't resolved the audio breaking. The rest
of the log file still looks the same!
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https://bugs.launchpad.net/bugs/1188425
Title:
Audio breaks up and pulseaudio eventually crashes with Alsa a52 (ac3)
plugin (Ubuntu 13.04)
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