I have a M-Audio Transit external sound device that I use to give me SPDIF output on a couple of older laptops. If I have the device in place when pulseaudio starts I get all the anlaog and digital outputs as I'm supposed to. However if I hotplug the device then I don't see any of the digital outputs at all. If I then do a 'pulseaudio -k', the outputs come back. What I see in the debug output during hotplug is: D: alsa-mixer.c: Checking for playback on Analog Stereo (analog-stereo) D: alsa-util.c: Trying front:2 with SND_PCM_NO_AUTO_FORMAT ... I: (alsa-lib)confmisc.c: Unable to find definition 'cards.USB-Audio.pcm.front.0:CARD=2' I: (alsa-lib)conf.c: function snd_func_refer returned error: No such file or directory I: (alsa-lib)conf.c: Evaluate error: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM front:2 I: alsa-util.c: Error opening PCM device front:2: No such file or directory D: alsa-util.c: Trying hw:2 with SND_PCM_NO_AUTO_FORMAT ... D: alsa-util.c: Managed to open hw:2 D: alsa-util.c: Maximum hw buffer size is 5944 ms D: alsa-util.c: Set buffer size first, period size second. D: alsa-mixer.c: Profile output:analog-stereo supported. ... D: alsa-mixer.c: Looking at profile output:analog-stereo+input:iec958-stereo D: alsa-mixer.c: Checking for recording on Digital Stereo (IEC958) (iec958-stereo) D: alsa-util.c: Trying iec958:2 with SND_PCM_NO_AUTO_FORMAT ... I: (alsa-lib)confmisc.c: Unable to find definition 'cards.USB-Audio.pcm.iec958.0:CARD=2,AES0=4,AES1=130,AES2=0,AES3=2' I: (alsa-lib)conf.c: function snd_func_refer returned error: No such file or directory I: (alsa-lib)conf.c: Evaluate error: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM iec958:2 I: alsa-util.c: Error opening PCM device iec958:2: No such file or directory rather than D: alsa-mixer.c: Checking for playback on Analog Stereo (analog-stereo) D: alsa-util.c: Trying front:2 with SND_PCM_NO_AUTO_FORMAT ... D: alsa-util.c: Managed to open front:2 D: alsa-util.c: Maximum hw buffer size is 5944 ms D: alsa-util.c: Set buffer size first, period size second. D: alsa-mixer.c: Profile output:analog-stereo supported. ... D: alsa-mixer.c: Looking at profile output:analog-stereo+input:iec958-stereo D: alsa-mixer.c: Checking for recording on Digital Stereo (IEC958) (iec958-stereo) D: alsa-util.c: Trying iec958:2 with SND_PCM_NO_AUTO_FORMAT ... D: alsa-util.c: Managed to open iec958:2 D: alsa-util.c: Maximum hw buffer size is 5944 ms D: alsa-util.c: Set buffer size first, period size second. D: alsa-mixer.c: Profile output:analog-stereo+input:iec958-stereo supported. when pulseaudio is started after the device is attached. Any suggestions as to what is going on here and how to fix it? -- Neil Wilson
