asterisk users - Mar 2008 - audio disappeared after ztdummy install

All too common and largely undocumented. I had this same problem.

Installing ztdummy changes Asterisk to use it for timing of playback,  
apparently. Removing ztdummy "fixed" the problem. To get it all to  
work, I had to upgrade to to at least kernel 2.6.23.11 (previous  
versions are either missing options are just broken.) After doing  
this, I recompiled ztdummy and it worked. Note that you need to  
enable the various and random kernel flags to make this work,  
generally dealing with the high-performance timer. I enabled:

HPET Timer Support
Enhanced Real Time Clock Support
HPET - High Precision Event Timer
HPET Control RTC IRQ
Allow mmap of HPET

I'm not sure if you can eliminate some of those, but this works for  
me and is stable.

Norman Franke
ASD, Inc.
www.myasd.com


On Mar 30, 2008, at 1:00 PM, asterisk-users-request at lists.digium.com  
wrote:
> This is a reasonably common problem.  ztdummy uses the Linux kernel  
> Real
> Time Clock (RTC) and something is wrong with it.   The solution is to
> recompile your kernel, you should  search the mailing list archives.
> Prepend "site:lists.digium.com" to your Google search to limit
your
> search to the mailinglist archives.

On Sun, Mar 30, 2008 at 02:35:03PM -0400, Norman W. Franke
wrote:
> All too common and largely undocumented. I had this same problem.
> 
> Installing ztdummy changes Asterisk to use it for timing of playback,  
> apparently. Removing ztdummy "fixed" the problem. To get it all
to
> work, I had to upgrade to to at least kernel 2.6.23.11 (previous  
> versions are either missing options are just broken.) 
Which previous versions have you tried?

I'll also note that the OP needs to get Zaptel working under Xen, which
is probably a different issue than your own.
> After doing  
> this, I recompiled ztdummy and it worked. Note that you need to  
> enable the various and random kernel flags to make this work,  
> generally dealing with the high-performance timer. I enabled:
> 
> HPET Timer Support
> Enhanced Real Time Clock Support
> HPET - High Precision Event Timer
> HPET Control RTC IRQ
> Allow mmap of HPET
> 
> I'm not sure if you can eliminate some of those, but this works for  
> me and is stable.
-- 
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