[LAU] Cracking sound via USB (ALSA urb.c:480: frame 5 active: -18)

[Aurélien Leblond]

cat /proc/interrupts gives the following
CPU0       CPU1       CPU2       CPU3       CPU4       CPU5       CPU6
CPU7
  0:         26          0          0     893152          0          0
   0          0   IO-APIC-edge      timer
  1:         22          0          0         31       5062          0
   0          0   IO-APIC-edge      i8042
  8:          0          0          0          1          0          0
   0          0   IO-APIC-edge      rtc0
  9:        729          0          0        148          0          0
   0          0   IO-APIC-fasteoi   acpi
 12:      74387          0          0        173          0          0
   0          0   IO-APIC-edge      i8042
 16:   11853419          0          0          0          0          0
  93          0   IO-APIC-fasteoi   ehci_hcd:usb1, brcmsmac
 21:     613255          0          0        241          0          0
   0          0   IO-APIC-fasteoi   ehci_hcd:usb2
 40:    1664049          0          0          0          0          0
   0          0  HPET_MSI-edge      hpet2
 41:          0     373735          0          0          0          0
   0          0  HPET_MSI-edge      hpet3
 42:          0          0     244881          0          0          0
   0          0  HPET_MSI-edge      hpet4
 43:          0          0          0     270616          0          0
   0          0  HPET_MSI-edge      hpet5
 44:          0          0          0          0    1035760          0
   0          0  HPET_MSI-edge      hpet6
 45:          0          0          0          0          0          0
   0          0   PCI-MSI-edge      eth0
 46:       6781       5882          0          0     424359          0
   0          0   PCI-MSI-edge      ahci
 47:          0          0          1          0          0          0
   0          0   PCI-MSI-edge      xhci_hcd
 48:          0          0          0          0          0          0
   0          0   PCI-MSI-edge      xhci_hcd
 49:          0          0          0          0          0          0
   0          0   PCI-MSI-edge      xhci_hcd
 50:          0          0          0          0          0          0
   0          0   PCI-MSI-edge      xhci_hcd
 51:          0          0          0          0          0          0
   0          0   PCI-MSI-edge      xhci_hcd
 52:          0          0          0          0          0          0
   0          0   PCI-MSI-edge      xhci_hcd
 53:          0          0          0          0          0          0
   0          0   PCI-MSI-edge      xhci_hcd
 54:          0          0          0          0          0          0
   0          0   PCI-MSI-edge      xhci_hcd
 55:          0          0          0          0        618          0
   0     181167   PCI-MSI-edge      radeon
 56:          0          0          0          0          0        255
 940          0   PCI-MSI-edge      hda_intel
 57:          0          0          0          0          0        624
   0          0   PCI-MSI-edge      hda_intel
NMI:          0          0          0          0          0          0
   0          0   Non-maskable interrupts
LOC:        146        135        118        101         83     292119
262176     323651   Local timer interrupts
SPU:          0          0          0          0          0          0
   0          0   Spurious interrupts
PMI:          0          0          0          0          0          0
   0          0   Performance monitoring interrupts
IWI:          0          0          0          0          0          0
   0          0   IRQ work interrupts
RES:       8835       2130       1206        621      13366       2364
1354        679   Rescheduling interrupts
CAL:        848       2123       2403       2402       1147       2676
2523       2331   Function call interrupts
TLB:      12484       8516       5371       4185      16856       5432
4059       2812   TLB shootdowns
TRM:          0          0          0          0          0          0
   0          0   Thermal event interrupts
THR:          0          0          0          0          0          0
   0          0   Threshold APIC interrupts
MCE:          0          0          0          0          0          0
   0          0   Machine check exceptions
MCP:         58         58         58         58         58         58
  58         58   Machine check polls
ERR:          0
MIS:          0


The sound cart is on the ehci usb1. I have noticed that my wifi card is
using the same IRQ, but on my kernel especially compiled for music, the
brcmsmac module is disabled.
That's enough to deactivate the hardware from using that interruption, isn't
it?

lsusb -t
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/3p, 480M
    |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/8p, 480M
        |__ Port 2: Dev 7, If 0, Class=hub, Driver=hub/7p, 480M
            |__ Port 4: Dev 8, If 0, Class=HID, Driver=usbhid, 1.5M
            |__ Port 4: Dev 8, If 1, Class=HID, Driver=usbhid, 1.5M
            |__ Port 7: Dev 9, If 0, Class=stor., Driver=usb-storage, 480M
        |__ Port 5: Dev 4, If 0, Class='bInterfaceClass 0x0e not yet
handled', Driver=uvcvideo, 480M
        |__ Port 5: Dev 4, If 1, Class='bInterfaceClass 0x0e not yet
handled', Driver=uvcvideo, 480M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/3p, 480M
    |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/6p, 480M
        |__ Port 1: Dev 4, If 0, Class=vend., Driver=snd-usb-audio, 480M
        |__ Port 1: Dev 4, If 1, Class=vend., Driver=snd-usb-audio, 480M
        |__ Port 1: Dev 4, If 2, Class=vend., Driver=snd-usb-audio, 480M
        |__ Port 1: Dev 4, If 3, Class=audio, Driver=snd-usb-audio, 480M
        |__ Port 1: Dev 4, If 4, Class=app., Driver=snd-usb-audio, 480M
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