[LAU] irq sharing
markknecht at gmail.com
Thu Aug 26 14:26:42 UTC 2010
On Thu, Aug 26, 2010 at 2:08 AM, david <gnome at hawaii.rr.com> wrote:
> David Santamauro wrote:
>> 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
>>>> 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:
>>> 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.
That would imply that everyone using a 1010LT in Linux would
experience the same noise, correct?
If I understand, you are saying that the card, with nothing plugged
into it, shows noise coming out of the card? If so it sounds like a
If he's local can you ask your Windows friend to plug your card into
his system for testing and see if it's noisy or not? Good weekend
project if he's game.
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