[LAU] noise problem, need some help

[Dave Phillips]

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