[LAU] noise problem, need some help

Greetings,

Recently my computer rebooted after a power outage and after having an
uptime of many months. I'm running Fedora 23 here, with Fernando's rt
kernel from Planet CCRMA, on hardware that includes an AMD FX6300, 16G
memory, a big hard drive, and nVidia graphics. For those months of
uptime I've enjoyed a smooth-running system with very few issues. The
CPU runs in performance mode, and as far as I can tell the system has
been sweetly optimized for realtime audio.

Alas, after rebooting I now have extremely annoying issues with noise
from my wireless mouse when running VCV Rack, which is a problem I never
had before the reboot. I suspect IRQ assignment, but I'm awfully rusty
at troubleshooting so I'm asking the group for advice.

My checklist so far:

1. Running the correct kernel ?

Linux The6300 4.6.7-200.rt14.1.fc23.ccrma.x86_64+rt #1 SMP PREEMPT RT
Sat Oct 1 16:06:12 PDT 2016 x86_64 x86_64 x86_64 GNU/Linux

2. CPU in Performance mode ?

'cat /proc/cpuinfo' reports 'cpu MHz: 3500.000' for all cores

3. rtprio set ?

$ rtirq status

   PID CLS RTPRIO NI PRI %CPU STAT COMMAND
   169 FF 70 - 110 0.0 S irq/8-rtc0
   748 FF 69 - 109 0.0 S irq/19-snd_hda_
   764 FF 69 - 109 2.0 S irq/20-snd_ice1
   166 FF 68 - 108 0.0 S irq/1-i8042
    85 FF 50 - 90 0.0 S irq/9-acpi
   138 FF 50 - 90 0.0 S irq/22-ahci[000
   150 FF 50 - 90 0.0 S irq/17-ehci_hcd
   151 FF 50 - 90 0.0 S irq/19-ehci_hcd
   153 FF 50 - 90 0.0 S irq/16-ohci_hcd
   154 FF 50 - 90 0.0 S irq/16-ohci_hcd
   155 FF 50 - 90 0.0 S irq/18-ohci_hcd
   156 FF 50 - 90 0.0 S irq/18-ohci_hcd
   159 FF 50 - 90 0.0 S irq/18-ohci_hcd
   430 FF 50 - 90 0.0 S irq/14-pata_ati
   431 FF 50 - 90 0.0 S irq/15-pata_ati
   706 FF 50 - 90 0.0 S irq/7-parport0
  1062 FF 50 - 90 0.0 S irq/26-enp2s0
  1178 FF 50 - 90 0.8 S irq/27-nvidia
   ...

Permissions are correct, and I have already tried switching the wireless
dongle to a different USB port. So what am I missing, what have I
forgotten ? The machine is the same as before the reboot, the kernel is
the same, and as far as I can tell the audio system is the same as it
ever was. I'm at a bit of a loss here, any and all help will be
appreciated.

Best regards,

dp
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Received on Sun Aug 26 16:15:02 2018