[CentOS] new kernel = no working sound

Sun Apr 10 19:15:20 UTC 2011
Rob Kampen <rkampen at kampensonline.com>

Iulian L Dragomir wrote:
> On Sun, Apr 10, 2011 at 8:45 PM, Rob Kampen <rkampen at kampensonline.com> wrote:
>> Check the order of driver loading. This affected me a few kernels ago. Found that one needs to force the order of driver loading in modprobe.conf HTH
> The modprobe.conf is looking like this:
> ========================
> alias eth0 e1000e
> alias scsi_hostadapter ata_piix
> alias snd-card-0 snd-hda-intel
> options snd-card-0 index=0
> options snd-hda-intel index=0
> remove snd-hda-intel { /usr/sbin/alsactl store 0 >/dev/null 2>&1 || :
> ; }; /sbin/modprobe -r --ignore-remove snd-hda-intel
> alias wlan0 iwl3945
> =======================
> The same configuration is used for both old (functional) and new
> (nonfunctional) kernels
> What are your suggestions regarding the order of drivers loading ?
I found that there was another module loading before the snd-hda-intel
thus I added index=0 to the one I needed and index=1 to the other module 
that seemed to get in the way.
the clue was looking under System>Administration>Sound Card Detection 
and seeing the  Audio configuration dialog > Settings tab - it showed my 
desired sound card as number 1 rather than 0 with another item as number 
0 (one I did not even know was on the computer).
Took me a recompiled kernel and hours of wasted time. Old kernels all 
worked fine - thus I thought it was a kernel patch problem - removed all 
the related patches and still no joy.
I do not know what they are doing to the kernel but over time the 
loading of modules, order of disk detection etc is becoming much more of 
an issue.
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