5 Apr
2007
5 Apr
'07
5:07 a.m.
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?
James