[LAU] Pops and clicks but no xruns

James Stone jamesmstone at gmail.com
Thu Apr 5 03:07:26 EDT 2007

On Thu, Apr 05, 2007 at 02:00:08AM -0400, Spencer Russell wrote:
> Recently I posted regarding nice low latencies on my brand-spankin-new
> Thinkpad R60. I was a bit premature though, because when I actually
> run any sound through jack I'm still getting lots of pops and clicks
> in my audio. I am not, however, getting any Xruns. I'm not sure what
> to look for as a culprit.
> I already enabled "force 16 bit", which got rid of some nasty
> distortion, maybe something wacky with my IRQs? One of my worries is
> that the HDA card is on the same interrupt as my firewire and one of
> my USB drives. When I remove the modules though, leaving only HDA on
> its own interrupt, i still get the pops.
> When I use audio without jack I get no clicks or pops, and changing
> jackd to capture only doesn't seem to help. I also boosted the
> priority of that interrupt thread with chrt --fifo --pid 99 `pidof
> 'IRQ 4'` without any change.

Just make sure that "IRQ 4" is listed as that. On my system I have
to do chrt -f -p 99 `pidof "IRQ-4"`

I get similar clicks from X interfering with sound unless the
sound card priority is increased. Also, I have the intel-HDA chip
on my board but I don't use it because it is noisy and badly
behaved compared to the SBLive (despite apparently lower
latencies). Some of this might be due to poor shielding, but
nontheless, I would not try to run it at lowest latency. Do you
get the clcks and pops if you increase to something like 512?


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