[mythtv-users] No sound only in mythtv after install of Ubuntu 10.10

Marc Grondin marcfgrondin at gmail.com
Thu Oct 14 12:33:02 UTC 2010


i have posted on the mythtv forum and ubuntu forum about this issue Figured
i would try to get help from as meny sources as possibble. so here is
transcript of my post:

I have a Hauppauge hvr 950-q that I had been using with 10.04 since it came
out with no issues at all(non that i could not fix anyways) had mythtv set
up using mythubuntu and all was great. I upgraded to 10.10 last night and
cannot get sound to work during live tv. If i watch an old recording the
sound works. Sound also works everywhere else on my system. Before the
upgrade the audio setting in the backend configuration of the tv card was
set to /dev/dsp2 this no longer works. if i put it at that(i have to enter
it manually) then i have no sound and if i try to change Channel the tv feed
crashes.

I have tried /dev/dsp2,1 i even tried /dev/snd/contolC1 wich i got from
browsing around in /dev and found this to point to my 950-q all with same
results.

If i use alsa:default as the audio device in the backend i still get no
sound but i am at least able to change channel.

everything works in TVTime.

i am simply at a loss. My next step was going to be a clean install of 10.10
but i thought i would check here before taking such a drastic step.

this is the output of aplay -l

**** List of PLAYBACK Hardware Devices ****
card 0: NVidia [HDA NVidia], device 0: STAC92xx Analog [STAC92xx Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 1: STAC92xx Digital [STAC92xx Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0

did not really get replies so i went ahead and reinstalled a fresh copy of
Ubuntu 10.10 but the problem was not solved

so i launched mythtv from shell to try and see what it was using for audio
input and saw this:

Found "HVR-950Q : USB Audio (hw:1,0)"

so i set the audio input in mythbackend to alsa:hw:1,0(Actually i think i
might have put in alsa:default:hw:1,0 not 100% sure. wich one would be
right?)

again anytime i use an audio input other than alsa:default i am not able to
change the channel


then i went and looked in the mythfrontend log and saw this:

ALSA lib pcm_dmix.c:1018: (snd_pcm_dmix_open) unable to open slave
2010-10-13 22:19:43.810 AudioOutput Error: snd_pcm_open(default): Device or
resource busy
2010-10-13 22:19:43.811 AO: Using resampler. From: 44100 to 48000
2010-10-13 22:19:43.811 Opening audio device 'default'. ch 2(2) sr 48000
(reenc 0)
2010-10-13 22:19:43.811 Opening ALSA audio device 'default'.
ALSA lib pcm_dmix.c:1018: (snd_pcm_dmix_open) unable to open slave
2010-10-13 22:19:43.812 AudioOutput Error: snd_pcm_open(default): Device or
resource busy
2010-10-13 22:19:43.812 NVP(0): Disabling Audio, reason is:
snd_pcm_open(default): Device or resource busy

what can i do to resolve this. audio work in tv time still and my old
recordings do play audio just not livetv(in mythtv)
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