[LAU] irq sharing

david gnome at hawaii.rr.com
Thu Aug 26 09:08:20 UTC 2010

David Santamauro wrote:
> Hi,
> On Tue, 24 Aug 2010 12:46:06 -0700
> Niels Mayer <nielsmayer at gmail.com> wrote:
>> On Tue, Aug 24, 2010 at 8:13 AM, David Santamauro <
>> david.santamauro at gmail.com> wrote:
>>> thanks for the time. I only have one PCI slot, but 3 empty PCI-x
>>> slots.
>>> I basically unplugged all USB devices as well as shut off both
>>> network interfaces and on board audio interface in the bios and the
>>> noise persists ...
>>> Not sure what to try next, this was a shot-in-the-dark.
>> If you think it's a interrupt-sharing issue, consider using a
>> pcie-to-pci riser to plug in your card. Apparently, this way of doing
>> things may ensure less bus contention:
>> http://old.nabble.com/does-a-pci-e-x1-to-pci-adapter-work-with-Linux-soundcards-and-existing-drivers--td29444687.html
>> Also, be sure that interrupt contention is really the problem. If
>> it's a constant noise, there's a better chance that it's a different
>> problem. One issue is that your recording software may not be using
>> the same bit depth, alignment, or complement as what the card
>> expects. I can get this effect on output, for example, simply by
>> using 'mplayer'
> interesting angle ... 
> envy24control (and the new mudita24) register this noise on input
> whether devices are plugged in or not. So the noise is clearly coming
> from either the delta breakout, card or driver. I've ruled out the
> breakout box and card simply by the fact that the noise doesn't exist
> on the same hardware with windows7 drivers.

Or the Windows drivers are doing something that removes the noise?

I have a friend who has a Delta 1010LT in his WindowsXP-based audio 
workstation. He's never said anything about input noise.

gnome at hawaii.rr.com
authenticity, honesty, community

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