Re: [LAU] irq sharing - Linux-audio-user

25 Aug 2010

Hi Fabrizio!

Thank you for the note informing me I am not alone. It is almost a
relief (almost). But I can't believe you and I are the only ones.

On Wed, 25 Aug 2010 12:59:22 +0200
Fabrizio Sciarra &lt;fsciarra62(a)gmail.com&gt; wrote:

...
  David, I don't see this message on the list, so I
send it directly to
 you too... I hope you don't get upset for this intrusion in your
 privacy... Let me know if I've hurted you in any way for this... In
 case I beg your pardon. 
Absolutely no intrusion and no offense taken at all.

...

 Dear David,
 I'm here just to confirm you I've more or less the same problem with
 my delta1010 card.
 I have a very nice *electronic* zipper noise any time I activate an
 input. I mean if I use the card as a "sound card" and use only
 outputs I have no noise at all, and isn't related to sampling rate,
 word width, buffer size or other jackd parameters.
 I can fire as many synths, filters or anything with no noise: as soon
 as I connect one input to one output.... zzzzzzzz.... 
same here ... jkmeter (and the new mudita24) show the zzzzzz dancing
around the -30db mark

...
  I noticed the card, in my previous install slackware64
13.0, was
 sharing the interrupt with the sata controller in AHCI mode.
 Disabling AHCI in the BIOS banged the noise (actually that caused the
 irq wasn't shared anymore with the disk controller).
 Now, slackware64 13.1, I've noise back. 
Interesting that a new OS would cause that ... has the AHCI setting
changed back or is it still disabled?

...
  I guess it's a mixed problem, drivers *and*
interrupts. Or whatever...
 it's a disaster... 
certainly is a disaster. My theory is the problem is the 64-bit ice1712
module.

...
  Currently I didn't solve the problem but now I see
another user has
 the same problem as I do.
 Ah, I forgot to tell that in the previous computer, actually with a 32
 bit install (was a Pentium4, this is a i7 fantacomputer), I didn't had
 any noise at all, never, ever... 
yes, I also confirmed in 32-bit fedora that everything is fine.

...
  I could try to install a 32bit slackware 13.1...
I'll tell you if it
 makes any change...
 Please if you find any interesting information post it, even
 privately... THANKS! 
I imagine it would, but do keep me informed!

thanks

David