[mythtv-users] No sound after upgrade to FC5

Dave mythtv at schooler.net
Mon Aug 7 01:06:34 UTC 2006


Hello again, Brad.

Brad Fuller wrote:
> Dave wrote:
>> Good afternoon, Brad.  Thank you for your response.
>>
>> Brad Fuller wrote:
>>   
>>> Dave wrote:
>>>     
>>>> Good morning, all.
>>>>
>>>> Been fighting this for weeks, and am at a loss.  Any ideas?
>>>>
>>>> Mythtv runs fine on Fedora Core 4.  My drive is dying, so I installed a 
>>>> new drive and installed Fedora Core 5 - all other hardware is unchanged. 
>>>> Sound on FC5 works fine everywhere except in mythtv and tvtime.  I can 
>>>> still (dual) boot into either OS - FC4 works great, and FC5 doesn't have 
>>>> sound.  Video works fine on both OSs. If I use mythtv to record a TV 
>>>> show and play it on my laptop with mythtv, it works when recorded on 
>>>> FC4, but there's no sound when recorded on FC5.
>>>>
>>>> The sound output of my Hauppauge WinTV goes to line-in on my sound card. 
>>>>   I'm assuming that there's something somewhere that is not set to 
>>>> capture the line-in from the sound card for mythtv.  "aplay /dev/dsp" 
>>>> doesn't produce sound (same with dsp0, dsp1, adsp, adsp0 adsp1).
>>>>   
>>>>       
>>> First, check to see if /dev/dsp actually exists. There are some reported
>>> issues that /dev/dsp isn't created correctly by udev (I have this
>>> problem on one of my FC5 computers). So, the first thing is to check
>>> that /dev/dsp is there if you want to use oss.
>>>     
>> It does exist in /dev...
>>
>> [dave at dave ~]$ ls -la /dev | grep dsp
>> crw-rw----  1 root root    14,  12 Aug  6 13:41 adsp
>> crw-rw----  1 root root    14,  28 Aug  6 13:41 adsp1
>> crw-------  1 dave root    14,   3 Aug  6 13:41 dsp
>> crw-------  1 dave root    14,  19 Aug  6 13:41 dsp1
>> [dave at dave ~]$
>>
>>   
>>> However, I suggest that you use alsa instead of oss. FC5 comes with alsa
>>> as the default.
>>> See if you can play a wave file with alsa:
>>>
>>> # aplay <a_test_file.wav>
>>>     
>> That works fine - I get good audio with aplay <wavefile.wav>  How do I 
>> choose between alsa and oss?  How do I tell which I'm currently using?
>>
>>   
>>> Another place to look is at your mixer. Make sure that the faders are
>>> up. Sometimes the default to all the way off.
>>>     
>> That's an area where I get lost.  When I open volume control, I have 
>> three devices:
>> 0: SiS SI7012 (Alsa Mixer)
>>   
> I assume this is from an intel onboard audio. Probably is your default.
> 
>> 1: Brooktree Bt878 (Alsa Mixer)
>>   
> I suppose this is from the WinTV card
>> 2: C-Media Electronics CMI9738 (OSS Mixer)
>>   
> 
>> There are a lot of settings there (which I've played with a fair 
>> amount), and it's not clear to me which should be turned up, 
>> enabled/disabled, speaker & mic mute, etc.
>>   
> Since you hear with aplay, you could turn all of them down one by one to
> see which one is the default.
> 
> In any case, the setting at:
> Setup>General>Audio
> should be set to "ALSA:default" and you'll be set.

I'm not sure where that setting is - maybe your mythtv is different than 
mine.  In mythtv, the closest setting I can find is in [Utilities/Setup] 
[Setup] [General] [Next] [Next] [Audio output device].  It's set to 
"/dev/dsp", and the other choices in the dropdown are "/dev/dsp1", 
"/dev/adsp", and "/dev/adsp1".  I've tried them all with no luck.  I did 
type ALSA:default in that same box, but it didn't seem to make a 
difference.  Still no sound.  :-(

>>   
>>>> I'm not sure what system info is relevant, so will start with just the 
>>>> kernel versions:
>>>>
>>>> 2.6.17-1.2157_FC5  (for Fedora Core 5)
>>>> 2.6.13-1.1526_FC4  (for Fedora Core 4)
>>>>
>>>> Where do I start troubleshooting this?  I'm afraid my "old" drive is 
>>>> going to die soon, and won't be able to use mythtv anymore.
>>>>
>>>> Thanks for any insight!
>>>>
>>>> Dave
>>>>       
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>>   
> 
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