Rob Kampen wrote:
Akemi Yagi wrote: 
On Tue, Jul 20, 2010 at 2:55 AM, Ned Slider <ned@unixmail.co.uk> wrote:
  
On 20/07/10 03:08, Rob Kampen wrote:

    
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
      
I would suggest you start checking back through the changelogs between
kernel-2.6.18-194.el5 and kernel-2.6.18-164.el5, find likely candidates
that may have caused your issue and then rebuild a testing kernel with
that patch reverted. If that testing kernel fixes your issue then you've
identified the issue and can file a bug report upstream.

To start you on your way, this patch looks like a likely candidate for
you to investigate further:

* Mon Dec 21 2009 Jarod Wilson <jarod@redhat.com> [2.6.18-183.el5]
- [sound] alsa hda driver update for rhel5.5 (Jaroslav Kysela) [525390]
    

Rob,

I understand you have already tried a workaround reported in:

https://bugzilla.redhat.com/show_bug.cgi?id=586532
correct, I've had to use this on a number of nvidia based machines already (unfortunately).
In this instance it was no help - not surprising as it is not an nvidia controller but intel chipset albeit with an nvidia graphics chip.
Before I bother Gary I'll try to revert to a default centos kernel rather than the centosplus kernel just to be sure.
Will keep you posted.
I have installed the standard Centos 2.6.18-194.8.1 .el5 kernel on the sony laptop and this fares no better - still no HDA-Intel sound card showing even though the driver is loaded.
On to plan B
I have started to setup an rpmbuild environment but need to read some more instructions, as when I followed the wiki I got different results - not sure if this is due to using the centosplus SRPM, as that is what all my workstations use, or due to my error in following instructions.
When I tried the make oldconfig after copying the config file as indicated I ended up having to respond to lots of option questions that I have no idea about, thus I'm likely to select an option that causes problems.
I thought make oldconfig was a process to dump out the current config settings so they could be used as a template for the new build......confused.
more reading coming my way.
According to comment #10 in there, Gary Gatling built a test kernel
with the above alsa patch removed. You might want to try asking him
for the kernel he built if you do not feel like building it yourself.

Akemi
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