Re: Crackling sound from usb sound device
On 03/23/2013 03:00 PM, Ralf Mardorf wrote:
With a new kernel there could be a different IRQ assignment, run
$ lsusb -t
/: Bus 08.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/: Bus 07.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/: Bus 06.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/: Bus 05.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/6p, 480M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/6p, 480M
|__ Port 5: Dev 2, If 0, Class=hub, Driver=hub/4p, 480M
|__ Port 1: Dev 6, If 0, Class=stor., Driver=usb-storage, 480M
|__ Port 2: Dev 4, If 0, Class=HID, Driver=usbhid, 1.5M
|__ Port 3: Dev 5, If 0, Class=HID, Driver=usbhid, 1.5M
|__ Port 4: Dev 7, If 0, Class=HID, Driver=usbhid, 12M
|__ Port 4: Dev 7, If 1, Class=audio, Driver=snd-usb-audio, 12M
|__ Port 4: Dev 7, If 2, Class=audio, Driver=snd-usb-audio, 12M
|__ Port 6: Dev 3, If 0, Class='bInterfaceClass 0x0e not yet
handled', Driver=uvcvideo, 480M
|__ Port 6: Dev 3, If 1, Class='bInterfaceClass 0x0e not yet
handled', Driver=uvcvideo, 480M
$ cat /proc/interrupts
CPU0 CPU1
0: 3269684 3403876 IO-APIC-edge timer
1: 5 4 IO-APIC-edge i8042
8: 1 0 IO-APIC-edge rtc0
9: 14598 14334 IO-APIC-fasteoi acpi
12: 80 78 IO-APIC-edge i8042
16: 0 0 IO-APIC-fasteoi uhci_hcd:usb6
17: 0 0 IO-APIC-fasteoi uhci_hcd:usb7
18: 0 0 IO-APIC-fasteoi uhci_hcd:usb8
19: 0 0 IO-APIC-fasteoi ehci_hcd:usb2
20: 0 0 IO-APIC-fasteoi uhci_hcd:usb3
21: 0 0 IO-APIC-fasteoi uhci_hcd:usb4
22: 0 0 IO-APIC-fasteoi uhci_hcd:usb5
23: 1335837 1235210 IO-APIC-fasteoi ehci_hcd:usb1
40: 0 0 PCI-MSI-edge PCIe PME, pciehp
41: 0 0 PCI-MSI-edge PCIe PME, pciehp
42: 0 0 PCI-MSI-edge PCIe PME, pciehp
43: 1088800 1086909 PCI-MSI-edge eth0
44: 89271 86161 PCI-MSI-edge ahci
45: 1 0 PCI-MSI-edge iwlwifi
46: 79040 50447 PCI-MSI-edge i915
47: 69 72 PCI-MSI-edge snd_hda_intel
NMI: 279 287 Non-maskable interrupts
LOC: 7434206 7155189 Local timer interrupts
SPU: 0 0 Spurious interrupts
PMI: 279 287 Performance monitoring interrupts
IWI: 0 0 IRQ work interrupts
RES: 1815335 1836327 Rescheduling interrupts
CAL: 10403 11478 Function call interrupts
TLB: 56509 46165 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
MCE: 0 0 Machine check exceptions
MCP: 116 116 Machine check polls
ERR: 0
MIS: 0
And if in use
$ /etc/init.d/rtirq status
/etc/init.d/rtirq: No such file or directory
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