On Wed, Aug 25, 2010 at 2:39 PM, Glenn Eychaner <geycha...@mac.com> wrote:
>        So, just today I noticed a problem with kernel 2.6.18-194 (CentOS 5.5) 
> on several Intel DP965LT systems; the system beeps (such as terminal beeps) 
> are no longer passed through to the external speakers.  This is a problem 
> because in our situation the boxes are distant from their monitor/keyboard, 
> the system speaker on this motherboard is extremely weak, and there are no 
> system speaker header pins on the motherboard.  The problem goes away if I 
> revert the system to 2.6.18-164 with no other changes.
>        I looked through the list archives and searched the web for other 
> people who have encountered this, but it's pretty specific (and hard to 
> search for "system beep"!)

Does it have Nvidia controllers? If so, it may be related to:

http://bugs.centos.org/view.php?id=4335

>  Is there someplace can I find *detailed* release notes on the differences 
> between -164 and -194 kernels to help in looking for the problem, pinning it 
> down, and submitting a patch (and/or building my own kernel), or should I 
> just download the SRPMS and dig in?

You can find kernel changelog diffs here (maintaind by Alan Bartlett):

http://www.centos.toracat.org/ajb/kernel-clog-diff/

Akemi
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