[CentOS] Audio fails on centos 5.5 sony laptop - snd-hda-intel

Tue Jul 20 02:08:30 UTC 2010
Rob Kampen <rkampen at kampensonline.com>

Rob Kampen wrote:
> Hi List, been chasing my tail for the last two hours and getting 
> nowhere on my wifes laptop.
> I only do updates monthly on her machine, as it is safely behind 
> firewalls and only does email and browser stuff.
> I have never had audio problems on this laptop, Centos just worked 
> from day one - even the wireless.
>
> It appears that the 5.5 kernels and related audio driver snd-hda-intel 
> do not function.
> If I reboot into 2.6.18-164.15.1.el5.centos.plus all is well.
> $ cat /proc/asound/cards
> 0 [Intel          ]: HDA-Intel - HDA Intel
>                      HDA Intel at 0x80000000 irq 169
> 1 [U0x46d0x804    ]: USB-Audio - USB Device 0x46d:0x804
>                      USB Device 0x46d:0x804 at usb-0000:00:1d.7-3, 
> high speed
>
> Neither 2.6.18-194.3.1.el5.centos.plus or 
> 2.6.18-194.8.1.el5.centos.plus have functioning sound.
> on these kernels I get
> $ cat /proc/asound/cards
> 0 [U0x46d0x804    ]: USB-Audio - USB Device 0x46d:0x804
>                      USB Device 0x46d:0x804 at usb-0000:00:1d.7-3, 
> high speed
>
> yet lsmod shows
> <snip>
> snd_hda_intel         472337  0
> snd_seq_dummy           7877  0
> snd_seq_oss            32577  0
> snd_seq_midi_event     11073  1 snd_seq_oss
> snd_seq                49585  5 
> snd_seq_dummy,snd_seq_oss,snd_seq_midi_event
> snd_pcm_oss            42817  0
> snd_usb_audio          77761  2
> snd_mixer_oss          19009  1 snd_pcm_oss
> snd_pcm                72133  3 snd_hda_intel,snd_pcm_oss,snd_usb_audio
> snd_usb_lib            19137  1 snd_usb_audio
> snd_rawmidi            26561  1 snd_usb_lib
> snd_timer              24517  2 snd_seq,snd_pcm
> snd_page_alloc         14281  2 snd_hda_intel,snd_pcm
> snd_seq_device         11725  4 
> snd_seq_dummy,snd_seq_oss,snd_seq,snd_rawmidi
> snd_hwdep              12869  2 snd_hda_intel,snd_usb_audio
> snd                    55749  15 
> snd_hda_intel,snd_seq_oss,snd_seq,snd_pcm_oss,snd_usb_audio,snd_mixer_oss,snd_pcm,snd_rawmidi,snd_timer,snd_seq_device,snd_hwdep 
>
> soundcore              11553  1 snd
>
> So I remembered the bug rh introduced with the 194 kernels and nvidia 
> chipsets (not my case but I'm desperate) and added the enable_msi=0 so 
> that my modprobe.conf is now
> <snip>
> options snd cards_limit=8
> alias snd-card-0 snd-hda-intel
> options snd-hda-intel index=0 enable_msi=0
>
> but it still will not work.
> <rant>
> I am getting frustrated at the retrograde steps that seem to be 
> hitting kernel and 5.x upgrades lately.
> yum update used to just work, get me the latest patches and all was 
> well - after all that is why I use Centos.
> </rant>
> I have tried modprobe -r to remove and reload module but to no avail.
> Anyone have any ideas as to what I try next?
> Google has not given me any ideas yet.
> TIA
>
Still no joy - I am at a loss to know what to check - if I boot a 194 
kernel no sound, 164 kernel is fine - why the regression?
Same configs, same modules loaded but now no sound - what can I check to 
determine problem and find a solution?
no errors in logs or dmesg
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>   

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