Dell C840 sound/audio problem

Dell / C840
March 1, 2009 at 06:53:45
Specs: Windows XP, Pentium 4 1 gb ram
Hi everybody,
I have a problem with audio on my Dell C840.
Whether it is a prompt sound, or audio from a cd, all sounds from either internal speakers or external via the headphones is being interrupted , or cut off, for 25 mS every 200 mS. I have monitored this using a storage scope so these times are pretty accurate.
Looks like some form of square wave interruption.
Is this a hardware problem, or is there some form of driver software which could be causing this.
Is there a limit on the memory allocated to audio conversion which I can extend.
Treat me as a dumbo please. The system is XP Pro.
Kind regards,

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March 1, 2009 at 09:30:42
Do you have an add in sound card or are you using the integrated sound?

Either way, the sound is most likely running on the PCI bus. The PCI bus is a shared bus. On enthusiast motherboards there are some adjustments to the way the bus is shared. On a Dell I doubt any settings are available.

Go into Device Manager and highlight the top line. Select View> resources by type> expand Interrupt Request. Look for the listing for the sound and see what IRQ is assigned to it. Then look for all other hardware that is also using (sharing) that IRQ.

List all hardware sharing the IRQ and also the IRQ number.

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March 3, 2009 at 02:03:53
Thank you for your reply.
The audio interrupt number was shared with a fax modem. Interrupt 5 on PCI. Disabled the modem, but no difference.
The only audio codec was Crystal wdm. I disabled this but no other audio codecs were available.
All audio and sounds go through the Crystal, which was stated to be functioning correctly, so I guess the problem lies in the d/a conversion before going to either internal or external speakers.
It was interesting to observe that when I re-enabled both the audio codec and the fax modem, they both appeared as a different interrupt number, int 7 instead of the previous int 5.
Thanks for your time anyway, it was appreciated.
Kind regards.

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