Re: [Gumstix-users] Alsa on 2.6.14 - not working?

[Craig H. <cr...@gu...>]

I've been working on alsa recently; Haven't got as far as getting  
alsa-libs and alsa-utils up yet, I was taking the "try and get OSS  
compatibility working" approach, and haven't been able to get that  
working.  Jared -- thanks for your patches -- I haven't had the  
chance to take a look yet -- but glancing at it now it looks like  
you've done the heavy lifting :)  I ought to be able to get shared  
lib alsa-libs working from your patch.  I'll take a look to compare  
what I did in the ucb1400 init patch function I had written for OSS/ 
AC97/UCB1400 too to see if there was stuff other than HPEN that I was  
sticking in there -- from memory there were a handful of other things  
too.

C

On Jan 15, 2006, at 9:38 AM, Jay K wrote:

> Excellent!!
>
> Yes, I have all the correct /proc and /sys items, the devices appear
> under /dev, but they don't actually output sound. :-/
>
> Do you mind sharing what config files did you put in place and what
> your modules file looks like?
>
> Thank you for offering!  I would love the patches...  You can send
> them to this email (or tell me where to download them from) whatever
> is easiest.
>
> Thank you!
>
> Jay
>
> On Jan 15, 2006, at 11:27 AM, Jared Boone wrote:
>
>> I have it working, and have contributed patches to Craig. I don't
>> see them in the 2.6.14 branch -- I don't think he's had time to
>> deal with them yet. If you'd like my patches, I can forward them on
>> to you. I can't say they're final or even particularly well done,
>> but they do work for me.
>>
>> The most important (high-level) details I can recall are:
>>
>> - I had to patch the ALSA kernel code to add an AC97 patch for the
>> UCB1400 codec. This is so I could control the headphone amplifier
>> (HPEN bit). I was getting low-level audio and terrible ground-loop
>> hum until I turned it on. I think it's due to the UCB1400's
>> floating output feature.
>>
>> - Compiling alsa-libs, and installing some of its configuration  
>> files.
>>
>> - Recompiling bplay or using alsa-utils aplay to use ALSA instead
>> of OSS. (Theoretically, the OSS compatibility layer should allow
>> the OSS-compiled bplay to work, but I didn't try this).
>>
>> - Loading/reloading udev after the ALSA kernel modules are loaded
>> -- this creates /dev/snd/ to look like this:
>>
>> controlC0
>> pcmC0D0c
>> pcmC0D0p
>> timer
>>
>> You should verify that /proc/asound has sane contents also. You
>> should see something like this:
>>
>> UCB1400/ -> card0/
>> card0/
>> cards
>> devices
>> meminfo
>> modules
>> oss/
>> pcm
>> timers
>> version
>>
>>    - Jared
>>
>> Jay K wrote:
>>
>>> Hi there,
>>>
>>> Has anyone got an audiostix playing audio back on the 2.6.14
>>> buildroot?
>>>
>>> I've been using an audiostix for some sound playback on the  
>>> 2.6.11gum
>>> kernel and it's been working fine (except for some background hiss
>>> that I attributed to line-in noise or something similar.  Yesterday,
>>> however, I installed the 2.6.14 rootfs and can't get any audio
>>> output.
>>>
>>> The modules will load and I know the device get initialized because
>>> the background hiss goes silent, but even though the modules are
>>> loaded and playback (bplay / madplay) will run, no audio comes out.
>>>
>>> At first I thought the volume was just set to 0.  But I recompiled
>>> the kernel with CONFIG_SND_MIXER_OSS=m and then I was able to adjust
>>> the main volume with aumix - but still no sound.
>>>
>>> If anyone has any suggestions, my remaining hair would be eternally
>>> grateful. :-)
>>
>>
>>
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