Re: Cracking sound via USB (ALSA urb.c:480: frame 5 active: -18)

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On 05/25/2011 05:36 PM, Emanuel Rumpf wrote:
> I'm currently testing rt performance with (( 2.6.39 SMP PREEMPT ))
> Compiled with tickless timer, config-hz 1000, hr-timer, low-latency preemtion.

same here.

> Crackling sound, here too !  But with a PCI card.

No problems here with UA-25 USB and internal HDA Intel.

> Maybe it's due to the rtirq script, which doesn't seem to work as
> expected with .39 ?

You need to add 'threadirqs' to the kernel-boot option to enable
threaded IRQ handlers with 2.6.39.

rtirq works just fine.

> I'm waiting for a working .config now.

I'm waiting for feedback from Daniel about a 2.6.39 kernel for
openDAW/64studio. Stay tuned.

The .config I'm currently using successfully on i386 thinkpad X60s is:
  http://rg42.org/_media/wiki/kernel/config-2.6.39.gz

Cheers!
robin
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