No Sound on Fedora 11 2.6.30 kernel (2.6.29 works fine)

[randyokc-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org (Randy Cole)]

I've never got the built-in microphone on this laptop to work under
Linux.  Nor the Agere modem...

Jerry Feldman wrote:
> On 10/12/2009 11:53 AM, David Rosenstrauch wrote:
>   
>> On 10/11/2009 07:53 AM, Jerry Feldman wrote:
>>   
>>     
>>> Sound works fine on my system with the 2.6.29 (specifically
>>> 2.6.29.6-217.2.16.fc11.x86_64) kernel, but when they updated to 2.6.30
>>> the sound stopped working. If I reboot back to the 2.6.29 kernel things
>>> work fine. I've googled a number of different places (including Fedora
>>> Forum http://forums.fedoraforum.org/showthread.php?t=225660), but no
>>> luck. Looking at some of the issues it appears to be something between
>>> front and back speakers. My system only has 1 audio array . My sound
>>> card is nVidia Corporation MCP55 High Definition Audio (rev a2). I've
>>> looked through all the different settings and run various Pulse Audio as
>>> well as ALSA mixers. When I look at the Pulse Audio volume meter, in
>>> both 2.6.29 and 2.6.30 kernels, it does show the volume levels. So far,
>>> I don't see any clues at either boot time or in dmesg.
>>>     
>>>       
>> Some common sound issues I've run into with recent kernels:
>>
>> * has one of the channels (e.g., master, PCM, front) been muted?
>> * has one of the channels (e.g., PCM, front) been set to volume 0?
>> * is the snd_pcsp module loaded?  (lsmod | grep snd_pcsp)  If so, unload 
>> it, and set it to not load.  (That's been known to interfere with other 
>> sound modules.)
>> * are any of the "Analog Loopback" switches turned on?  If so, turn them 
>> off, as they can disable sound.  (I tore my hair out over that one for 
>> quite a while.)
>>
>>   
>>     
> No to all. The two things I have not done are 1) Compared the alsa-info
> output between 2.6.29 and 2.6.30, and rebuilt the alsa drivers. All
> switch settings are the same between .29 and .30, but bootong into .29
> sound works fine, bootong into .30 sound does not work. Once I compare
> the alsa-info data, I might remove everything sound related and install
> only the core systems. I had install a lot of the OSS compatibility
> stuff for Skype 32-bit, so it might be that there is a module that
> somehow is disabling the output on the .30 kernel, but not on the .29
> kernel that I might discover by doing the tedious thing. Another
> possibility is to try out the .31 kernel (or possibly install Fedora 12.
> Beta release is scheduled for next week.
>
>   
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