Re: Crackling sound from usb sound device
On Sat, 2013-03-23 at 16:04 +0100, Klaus Pieper wrote:
> > $ lsusb -t
> >
> /: 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
Does it crackle, when the USB storage device and the USB video device
are unplugged? Were the USB storage and video devices plugged to other
USB slots in the past?
> > $ cat /proc/interrupts
> 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
No IRQ issue.
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