[mythtv-users] Audio up/down/mute don't work after upgrade

[James Cummings]

Hiya,

I've just upgraded my myth box to Ubuntu 8.04, and most things seem to
be working ok (not yet tried everything...)  however, something is
wrong with the control of sound.

When I am playing live tv or watching a recording, I cannot
raise/lower the volume or mute.

Now it isn't the remote control or lircd because when I press the keys
the correct thing is displayed on the screen.  I.e. when I press
volume down multiple times, the volume bar comes on the screen and I
can raise and lower it...it just has no actual effect on the volume.
Same with mute, I get 'mute on' temporarily on the screen, but it
doesn't mute it.

So it seems like it is something to do with the audio settings, I've
looked in general -> audio page and tried a few non-alsa settings as
well as the default, /dev/dsp, etc. but nothing seems to work. (one
setting did remove the ability to appear to be changing it at all).

 My mythtv specific audio settings are:

Audio output device: ALSA:default (but tried all of them)
Passthrough: default
Max Audio Channels: Stereo
Upmix: Passive
x Use internal volume controls
Mixer: ALSA:default (but tried /dev/mixer as well)
Mixer Controls: Master (but tried PCM as well)


The output of "alsamixer":

alsamixer: function snd_mixer_load failed: No such file or directory

and "lsmod |grep snd":

~$ lsmod |grep snd
snd_hda_intel         344728  0
snd_pcm_oss            42144  0
snd_mixer_oss          17920  1 snd_pcm_oss
snd_pcm                78596  2 snd_hda_intel,snd_pcm_oss
snd_page_alloc         11400  2 snd_hda_intel,snd_pcm
snd_hwdep              10500  1 snd_hda_intel
snd_seq_dummy           4868  0
snd_seq_oss            35584  0
snd_seq_midi            9376  0
snd_rawmidi            25760  1 snd_seq_midi
snd_seq_midi_event      8320  2 snd_seq_oss,snd_seq_midi
snd_seq                54224  6
snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event
snd_timer              24836  2 snd_pcm,snd_seq
snd_seq_device          9612  5
snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq
snd                    56996  11
snd_hda_intel,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_hwdep,snd_seq_dummy,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
soundcore               8800  1 snd


And "$ lspci |grep Audio" is:

00:10.1 Audio device: nVidia Corporation MCP51 High Definition Audio (rev a2)

and output of  "$ aplay -l" is:
**** List of PLAYBACK Hardware Devices ****
card 0: NVidia [HDA NVidia], device 0: ALC861 Analog [ALC861 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Just in case any of that helps.

Any suggestions appreciated!

-James