[mythtv-users] Can't change volume from 0

[Dan Wilga]

On 12/28/15 3:44 PM, Simon Hobson wrote:
> Dan Wilga <mythtv-users2 at dwilga-linux1.amherst.edu> wrote:
>
>> It sounds as though the frontend may be trying (and failing) to change the volume. Check the permissions of the mixer device to be sure it is writable by the user running the frontend.
> Doh, you prompted me to do what should have been the first step - check the logs. I found this :
>> 2015-12-28 18:39:09.986 ALSA, Error: snd_pcm_open("default"): No such file or directory
>> 2015-12-28 18:39:09.986 AO: Opening audio device 'default' ch 2(2) sr 48000 sf signed 16 bit reenc 0
>> 2015-12-28 18:39:09.986 ALSA, Error: snd_pcm_open("default"): No such file or directory
>> 2015-12-28 18:39:09.986 AudioOutput Error: Aborting reconfigure
>> 2015-12-28 18:39:09.987 AudioPlayer: Disabling Audio, reason is: Aborting reconfigure
> I think I know what the problem is now. The 'new' box has a couple of tuners in it - so sound inputs but no outputs. The tuners have been setup first so the sound output is on card #2. Just need to prevent the tuners being loaded I think.
>
> Main audio is Intel :
> 00:1b.0 Audio device: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) High Definition Audio Controller (rev 04)
>
> Tuners are Connexant :
> 01:04.0 Multimedia video controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder (rev 05)
> 01:04.1 Multimedia controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder [Audio Port] (rev 05)
> 01:04.2 Multimedia controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder [MPEG Port] (rev 05)
>
> 01:0b.0 Multimedia video controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder (rev 05)
> 01:0b.1 Multimedia controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder [Audio Port] (rev 05)
> 01:0b.2 Multimedia controller: Conexant Systems, Inc. CX23880/1/2/3 PCI Video and Audio Decoder [MPEG Port] (rev 05)
You should not have to disable the tuners. You probably just have to 
tell Myth to re-scan the sound device list and select what's appropriate 
(it's in the settings). This, of course, assumes ALSA has indeed 
detected the Intel hardware correctly. Try:

   lsmod | grep snd_hda_intel

It should show something like:

   snd_hda_intel          30519  0