[ubuntu-studio-users] Ardour, X32, and USB

Mac macdroid53 at gmail.com
Wed Aug 10 12:09:10 UTC 2016


Hi Ralf,

The output of cat was powersave for all cpu's.

the irq stat:

  PID CLS RTPRIO  NI PRI %CPU STAT COMMAND
  539 FF      90   - 130  0.0 S    irq/17-snd_hda_
  558 FF      90   - 130  0.0 S    irq/126-snd_hda
  112 FF      85   - 125  4.4 S    irq/122-xhci_hc
  114 FF      80   - 120  0.0 S    irq/1-i8042
  113 FF      79   - 119  0.0 S    irq/12-i8042
   58 FF      50   -  90  0.0 S    irq/9-acpi
  115 FF      50   -  90  0.0 S    irq/8-rtc0
  178 FF      50   -  90  0.0 S    irq/19-mmc0
  185 FF      50   -  90  0.0 S    irq/123-0000:00
  409 FF      50   -  90  0.0 S    irq/124-mei_me
  488 FF      50   -  90  0.0 S    irq/125-iwlwifi
  922 FF      50   -  90  0.0 S    irq/128-enp59s0
 1667 FF      50   -  90  0.0 S    irq/127-nvidia
  179 FF      49   -  89  0.0 S    irq/19-s-mmc0
  489 FF      49   -  89  0.0 S    irq/125-s-iwlwi
    3 TS       -   0  19  0.0 S    ksoftirqd/0
   14 TS       -   0  19  0.0 S    ksoftirqd/1
   19 TS       -   0  19  0.0 S    ksoftirqd/2
   24 TS       -   0  19  0.0 S    ksoftirqd/3
   29 TS       -   0  19  0.0 R    ksoftirqd/4
   34 TS       -   0  19  0.0 S    ksoftirqd/5
   39 TS       -   0  19  0.0 S    ksoftirqd/6
   44 TS       -   0  19  0.0 S    ksoftirqd/7


That said, Paul suggested I give the Ardour ALSA backend a try. (Thanks
Paul, I learned something new about Ardour!)

Unfortunately I got the same results.

So, back to basics, a made a list of things I had and hadn't tried.

Assumptions are the nemesis of trouble shooting. I had grabbed a long-ish
usb cable of unknown origin. When I replaced it with a shorter, brand new
cable the issue went away and seems to work for both JACK and the ALSA only
backend in Ardour.

I assumed if the usb ports were connected the cable was probably ok. Guess
I was wrong. I guess something about the cable was causing high error rates
(capacitance, grounding, shielding, etc.).

Regards,
Mac

On Mon, Aug 8, 2016 at 8:35 AM, Ralf Mardorf <ralf.mardorf at alice-dsl.net>
wrote:

> On Mon, 8 Aug 2016 08:24:25 -0400, Mac wrote:
> >During playback, there are random clicks
>
> If you run
>
>   cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
>
> the output should be "performance" for each core of your CPU.
>
> If it shouldn't be "performance", then run
>
>   echo performance|sudo tee /sys/devices/system/cpu/cpu*/
> cpufreq/scaling_governor
>
> Consider to post the output of
>
>   /etc/init.d/rtirq status
>
> Regards,
> Ralf
>
> --
> ubuntu-studio-users mailing list
> ubuntu-studio-users at lists.ubuntu.com
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